JP6034674B2 - Search information obfuscation device, search information obfuscation method, and program - Google Patents

Description

  The present invention relates to a search information obfuscation apparatus, a search information obfuscation method, and a program for obfuscating search information in a search on the Internet.

  In recent years, users have collected various information using a search system on the Internet. When a user uses a search engine on the Internet, a keyword or the like (hereinafter referred to as a search keyword) is input as a search query to make an inquiry to the search engine. This search keyword represents what the user wants, and the information value is extremely high. For this reason, there are search engines that take statistical information of search keywords to examine user hobbies and preferences and use them in marketing (see, for example, Non-Patent Document 1).

  On the other hand, it is known what kind of content is focused on and what information is currently collected, such as users who think that hobbies and preferences are known to others as infringement of privacy and corporate research institutions. Users who do not want to search do not want to be acquired by a third party even for marketing purposes.

  Here, there are two possible routes through which search keywords leak during search. One is a case where the user is eavesdropped while transmitting a search query including a search keyword to the search engine, and the other is a case where the search keyword is collected inside the search engine. For the first case, a technique for preventing a search keyword from leaking by encrypting a search query in a communication path is often used (for example, see Non-Patent Document 2). With the technique described in Non-Patent Document 2, a search can be performed securely even when a search engine or a search database is outside a cloud service or the like.

  However, even in this method, in order to obtain an appropriate search result from the search engine, the encrypted search query needs to be decrypted by the search engine, and the search keyword is collected inside the search engine. There was a problem that the leakage of search keywords due to the eye case could not be prevented.

Google privacy policy “http://www.google.co.jp/intl/ja/policy/privacy/” [retrieved on November 15, 2012] Fingerprint technology that enables similar retrieval of text containing numbers: Takatsuki, Yoshinori Katayama, Junya Morikawa, Hiroshi Tsuda, Information Processing Society of Japan. Report of Basic Research Group on Informatics 2011-IFAT-104 (2), 1-7, 2011-11-15

  Therefore, by using a technique described in Japanese Patent Application Laid-Open No. 2009-198175 that makes it difficult to observe from an attacker by outputting a signal equivalent to the surrounding environment, A method for transmitting a search query to a search engine is conceivable. This technique makes it difficult for the search engine to analyze which search query includes the search keyword that is important information for the search user, and prevents leakage of the search keyword due to the second case.

  However, in order to create a large number of search queries and to send a large number of search queries to a search engine, there is a problem that extremely large equipment and cost are required. In addition, since a large number of search queries are transmitted, there is a problem that it takes time until the user acquires necessary information.

  Therefore, the present invention has been made in view of the above-described problems, and is difficult to read by replacing a phrase of the search information with another phrase or combining a phrase that obfuscates the language tendency of the search information with the search information. It is an object of the present invention to provide a search information obfuscation device, a search information obfuscation method, and a program that realize secure Internet search by performing a search with the converted search information. Another objective is to statistically obfuscate the language tendency of confidential information.

  The present invention proposes the following matters in order to solve the above problems. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this.

(1) The present invention is a search information obfuscation device (e.g., equivalent to the search information obfuscation device 100 of FIG. 1) that obfuscates a language tendency in search information related to Internet search from a third party. Dictionary storage means for storing dictionary data indicating the relationship of the search information (for example, equivalent to the dictionary storage unit 120 in FIG. 1), and related search phrases related to the search phrases included in the search information are obfuscated from the dictionary storage means As a related phrase acquisition unit (for example, equivalent to the related phrase acquisition unit 111 of FIG. 1), and a process of acquiring a phrase related to the phrase acquired from the dictionary storage unit from the dictionary storage unit one or more times, Low-related search phrase acquisition means (for example, FIG. 1) that acquires a low-relevance search phrase that is low in relation to each acquired phrase group from the dictionary storage means as the obfuscated phrase. The low-related search phrase acquisition unit 112) , the obfuscation search information that generates the obfuscation search information based on the search information and the obfuscation phrases acquired by the related phrase acquisition means and the low-relevance search phrase acquisition means A search information obfuscation apparatus is proposed that includes a generation unit (e.g., corresponding to the obfuscation search information generation unit 130 in FIG. 1).

According to the present invention, the dictionary storage means stores dictionary data indicating the relationship between words. The related phrase acquisition unit acquires a related search phrase related to the search phrase included in the search information from the dictionary storage unit as an obfuscated phrase. The low-related search phrase acquisition unit repeats the process of acquiring a phrase related to the phrase acquired from the dictionary storage unit from the dictionary storage unit one or more times, and the dictionary storage unit stores the low-related search phrase that is low in relation to each acquired phrase group. From the obfuscated word. The obfuscation search information generation means generates the obfuscation search information based on the obfuscated words and the search information acquired by the related phrase acquisition means and the low related search phrase acquisition means . Therefore, by combining the search information with related terms and phrases related to the search information and low related search terms that are less relevant to the search information and related terms and phrases related to the hierarchy, the language tendency is different from the language tendency of the search information. The search information can be deceived by a third party by searching using the obfuscated search information having the. As a result, it is possible to realize a secure Internet search that is difficult to leak search information to a third party.

(2) The present invention relates to the search information obfuscation device of (1), wherein the low-related search word acquisition unit extracts a low-related search word / phrase having a low relationship with the search word / phrase included in the search information from the dictionary storage unit. A retrieval information obfuscation apparatus, characterized in that a process of acquiring and acquiring a phrase related to the acquired phrase from the dictionary storage means is repeated one or more times, and the acquired phrase group is acquired as the obfuscated phrase. is suggesting.

According to this invention, the low-related search phrase acquisition unit acquires from the dictionary storage unit the low-related search phrase that is not related to the search phrase included in the search information, and the phrase related to the acquired phrase from the dictionary storage unit. The process of acquiring is repeated one or more times, and the acquired phrase group is acquired as an obfuscated phrase. Therefore, when a third party analyzes the obfuscated search information by combining the search information with a low-related search phrase that is not related to the search phrase and a group of words related to the low-related search phrase in a hierarchical manner, the low-relevance search It is possible to extract the linguistic tendency obtained from the phrase and the phrase group related in a hierarchical manner to the phrase and the low-relevance search phrase, so that the linguistic tendency of the real search information is not extracted. As a result, it is possible to realize a more secure Internet search that is less likely to leak search information to a third party.

(3) The present invention relates to the search information obfuscation device according to (1) or (2), wherein the obfuscation word acquisition unit is related to search subject information that identifies the subject of the Internet search included in the search information. Search obfuscation search information generation means comprising search subject related phrase acquisition means (for example, equivalent to the search subject related phrase acquisition unit 113 in FIG. 1) for acquiring a search subject related phrase as the obfuscated phrase from the dictionary storage means However, the search information obfuscation apparatus is characterized in that the obfuscation search information is generated by combining the obfuscation phrase acquired by the search subject related phrase acquisition unit with the search information.

According to this invention, the search subject-related phrase acquisition unit acquires, as an obfuscated phrase, from the dictionary storage unit, a search subject-related phrase that is related to the search subject information that identifies the subject of the Internet search included in the search information. The obfuscated search information generating means generates the obfuscated search information by combining the obfuscated words acquired by the search subject related word acquiring means with the search information. Therefore, by combining the search information with a search subject-related phrase that is related to the search subject in the search information, it is possible to perform a search using the obfuscated search information having a language tendency different from the language tendency of the search information. As a result, it is possible to realize a secure Internet search that is difficult to leak search information to a third party.

(4) In the search information obfuscation device according to (3), the present invention obtains, as the obfuscated phrase, from the dictionary storage means, a low-relevance search subject phrase that is not related to the search subject information included in the search information. The obfuscation obtained by the obfuscated search information generating unit is acquired by the low related search subject phrase acquiring unit (for example, the low related search subject phrase acquiring unit 114 of FIG. 1). A search information obfuscation apparatus has been proposed in which obfuscation search information is generated by combining a phrase with the search information .

According to this invention, the low-related search subject phrase acquisition unit acquires, as an obfuscated phrase, from the dictionary storage unit, the low-related search subject phrase that is not related to the search subject information included in the search information. The obfuscation search information generation unit generates the obfuscation search information by combining the obfuscated words acquired by the low-related search subject word acquisition unit with the search information. Therefore, by combining the search information with a low-relevance search subject word / phrase having a low relationship with the search subject, it is possible to perform a search using the obfuscated search information having a language tendency different from the language tendency of the search information. As a result, it is possible to realize a secure Internet search that is difficult to leak search information to a third party.

(5) The present invention is, for search information obfuscation device (4), wherein the low Related searches main word acquisition unit, a process of acquiring a word associated with the word acquired from the dictionary storage means from the dictionary storage means A search information obfuscation apparatus is proposed, characterized in that it repeats one or more times, and acquires the low-relevance search subject word / phrase associated with each of the acquired word / phrase groups as the obfuscated word / phrase from the dictionary storage means .

According to this invention, the low-relevance search subject phrase acquisition unit repeats the process of acquiring the phrase related to the phrase acquired from the dictionary storage unit from the dictionary storage unit one or more times , and the low-relevance search subject phrase acquisition unit relates to each acquired phrase group. The search subject phrase is acquired from the dictionary storage means as an obfuscated phrase . Therefore, when a third party analyzes the obfuscated search information by combining the search information with a low-relevance search subject phrase that is not related to the search subject and a low-relevance search phrase in a hierarchical manner, It is possible to extract the linguistic tendency obtained from the phrase group related to the phrase in a hierarchical manner, and not to extract the linguistic tendency of the real search information. As a result, it is possible to realize a more secure Internet search that is less likely to leak search information to a third party.

(6) The present invention relates to the search information obfuscation device of (1) to (5), and associates the content acquired by the Internet search with the obfuscation search information with the search information corresponding to the obfuscation search information. Search content storage means (for example, corresponding to the search content storage unit 150 in FIG. 3), the content stored in the search content storage means, and the search information associated with the content. The number of obfuscation phrases determining means for determining the number of obfuscation phrases included in the obfuscation search information based on the appearance frequency of the search phrases included in the search information (for example, equivalent to the obfuscation phrase count determination unit 160 in FIG. 3) ), And the obfuscation search information generation means is based on the number of obfuscation words determined by the obfuscation word number determination means. It proposes a search information obfuscation apparatus characterized by selecting the obfuscated phrase including al the obfuscation search information.

According to this invention, the search content storage means stores the content acquired by the Internet search using the obfuscated search information in association with the search information corresponding to the obfuscated search information. The obfuscation word count determining means is based on the content stored in the search content storage means and the search information associated with the content, and based on the appearance frequency of the search words included in the search information, Determine the number of obfuscated words to include. The obfuscation search information generation unit selects the obfuscation words to be included in the obfuscation search information from the obfuscation words based on the number of obfuscation words determined by the obfuscation word number determination unit. Therefore, it is possible to statistically obfuscate the linguistic tendency of the search information by determining the number of obfuscated words included in the obfuscated search information used for the search according to the appearance frequency of the search information included in the search result content. it can. As a result, it is possible to arbitrarily set the difficulty of leaking search information, that is, the degree of confidentiality of search information.

(7) The present invention relates to a search information obfuscation method in a search information obfuscation device that obfuscates a language tendency of search information related to Internet search from a third party, wherein the search information obfuscation device is a term between words. A dictionary storage means for storing dictionary data indicating association, a related phrase acquisition means, a low-related search phrase acquisition means, and an obfuscated search information generation means are provided, and the related phrase acquisition means is related to a search phrase included in the search information A first step (for example, corresponding to step S1 in FIG. 2) of acquiring the related search phrase as an obfuscated phrase from the dictionary storage means, and the phrase acquired by the low related search phrase acquisition means from the dictionary storage means The process of acquiring a word or phrase related to the word from the dictionary storage means is repeated one or more times, and low related search phrases that are less relevant for each of the acquired word groups are stored in the dictionary. A second step (for example, corresponding to step S2 in FIG. 2) acquired from the storage means as the obfuscated phrase, and the obfuscation search information generating means acquired in the first step and the second step. A search information obfuscation method comprising: a third step (for example, corresponding to step S2 of FIG. 2) for generating obfuscation search information based on the vocabulary and the search information Yes.

According to this invention, first, in a first step, the related phrase acquisition unit acquires a related search phrase related to the search phrase included in the search information from the dictionary storage unit as an obfuscated phrase. Next, in the second step, the low-related search phrase acquisition unit repeats the process of acquiring the phrase related to the phrase acquired from the dictionary storage unit from the dictionary storage unit one or more times, and the relationship is obtained for each acquired phrase group. A low low-related search phrase is obtained as an obfuscated phrase from the dictionary storage means . Next, in the third step, the obfuscated search information generating means generates the obfuscated search information based on the obfuscated words and the search information acquired in the first step and the second step. Therefore, by combining the search information with related terms and phrases related to the search information and low related search terms that are less relevant to the search information and related terms and phrases related to the hierarchy, the language tendency is different from the language tendency of the search information. The search information can be deceived by a third party by searching using the obfuscated search information having the. As a result, it is possible to realize a secure Internet search that is difficult to leak search information to a third party.

(8) The present invention is a program for causing a computer to execute a search information obfuscation method in a search information obfuscation apparatus that obfuscates a language tendency of search information related to Internet search from a third party. The obfuscation apparatus includes a dictionary storage unit that stores dictionary data indicating a relationship between phrases, a related phrase acquisition unit, a low-related search phrase acquisition unit, and an obfuscation search information generation unit, and the related phrase acquisition unit includes the search A first step (for example, corresponding to step S1 in FIG. 2) of acquiring a related search phrase related to a search phrase included in information as an obfuscated phrase from the dictionary storage unit, and the low-related search phrase acquisition unit, Repeat the process of acquiring a phrase related to the phrase acquired from the dictionary storage means from the dictionary storage means at least once, and each of the acquired phrase groups A second step (for example, corresponding to step S2 in FIG. 2) of acquiring a low-relevance search phrase having a low relation from the dictionary storage unit as the obfuscated phrase; And causing the computer to execute a third step (for example, corresponding to step S2 in FIG. 2) of generating obfuscated search information based on the obfuscated phrase acquired in the step and the second step and the search information. A program for this is proposed.

According to this invention, first, in a first step, the related phrase acquisition unit acquires a related search phrase related to the search phrase included in the search information from the dictionary storage unit as an obfuscated phrase. Next, in the second step, the low-related search phrase acquisition unit repeats the process of acquiring the phrase related to the phrase acquired from the dictionary storage unit from the dictionary storage unit one or more times, and the relationship is obtained for each acquired phrase group. A low low-related search phrase is obtained as an obfuscated phrase from the dictionary storage means . Next, in the third step, the obfuscated search information generating means generates the obfuscated search information based on the obfuscated words and the search information acquired in the first step and the second step. Therefore, by combining the search information with related terms and phrases related to the search information and low related search terms that are less relevant to the search information and related terms and phrases related to the hierarchy, the language tendency is different from the language tendency of the search information. The search information can be deceived by a third party by searching using the obfuscated search information having the. As a result, it is possible to realize a secure Internet search that is difficult to leak search information to a third party.

  According to the present invention, a secure search is performed by performing a search with obfuscated search information by replacing a search phrase with another phrase, or by combining a phrase that obfuscates the language tendency of the search information with the search information. Internet search can be realized. Moreover, it is possible to statistically obfuscate the language tendency of the secret information.

It is a figure which shows the function structure of the search information obfuscation apparatus in the 1st Embodiment of this invention. It is a flowchart of the search information obfuscation process in the search information obfuscation apparatus in the 1st Embodiment of this invention. It is a figure which shows the function structure of the search information obfuscation apparatus in the 2nd Embodiment of this invention. It is a figure which shows the function structure of the search information obfuscation apparatus in the 3rd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the constituent elements in the present embodiment can be appropriately replaced with existing constituent elements and the like, and various variations including combinations with other existing constituent elements are possible. Therefore, the description of the present embodiment does not limit the contents of the invention described in the claims.

<First Embodiment>
<Search information obfuscation device>
FIG. 1 is a diagram showing a functional configuration of a search information obfuscation apparatus 100 according to the first embodiment of the present invention. The search information obfuscation apparatus 100 is an apparatus that obfuscates the language tendency of the search information included in the search query transmitted to the search engine in order to prevent the search information from leaking to a third party. Here, the search information is information composed of one or more search keywords and information of a user who performs a search (hereinafter referred to as a search user). As shown in FIG. 1, the search information obfuscation apparatus 100 includes an obfuscation word acquisition unit 110, a dictionary storage unit 120, an obfuscation search information generation unit 130, and a search unit 140.

  In the present embodiment, the search information obfuscation apparatus 100 includes the search unit 140, but the search information obfuscation apparatus 100 may not include the search unit 140. In this case, the search information obfuscation apparatus 100 acquires the search information included in the search query from another terminal, obfuscates the language tendency of the acquired search information, and sets the search information obfuscated the language tendency to the other terminal. return.

  The dictionary storage unit 120 stores dictionary data in which associations between words are defined. Specifically, the dictionary storage unit 120 stores dictionary data in which related words are associated with each other and a related relationship between related words is defined. Here, the relationship is a relationship such as a synonym relationship, a synonym relationship, a vertical relationship, an inclusion relationship, a co-occurrence relationship, an associative relationship, or the like. For example, the related dictionary data includes thesaurus dictionary data and co-occurrence word dictionary data. In addition, the dictionary storage unit 120 may store dictionary data in which words that are not related or are not related are associated with each other. Further, the dictionary data in the dictionary storage unit 120 may include the degree of association between related words. The words included in the dictionary data in the dictionary storage unit 120 are not limited to Japanese, but may be a foreign language such as English.

  The obfuscated phrase acquisition unit 110 acquires a phrase used to obfuscate the language tendency of the search information included in the search query transmitted to the search engine. In the present embodiment, the phrase used to obfuscate the language tendency of the search information includes a phrase related to the search information, a phrase related to the search user, and a low relationship with the search information and the search user, or Use unrelated words. As shown in FIG. 1, the obfuscation phrase acquisition unit 110 acquires each phrase used to obfuscate the language tendency of the search information, the related phrase acquisition unit 111, the low-related search phrase acquisition unit 112, and the search subject-related A word acquisition unit 113 and a low-related search subject word acquisition unit 114 are included.

  The related phrase acquisition unit 111 acquires a phrase related to each search keyword included in the search information from the dictionary storage unit 120. For example, when the search keyword is “solar battery”, the related phrase acquisition unit 111 has a similar relationship “photocell”, a synonymous “solar panel”, and a co-occurrence relationship from the dictionary storage unit 120. Acquire “solar power generation”. Further, the related phrase acquisition unit 111 may acquire a phrase related to each search keyword included in the search information from the dictionary storage unit 120 based on the relationship between the related phrases. For example, the related phrase acquisition unit 111 can acquire only words having a co-occurrence relationship or words having an association relationship. The related phrase acquisition unit 111 may acquire all the phrases related to the information of each search keyword included in the search information from the dictionary storage unit 120, or may acquire a preset number.

  When the dictionary data in the dictionary storage unit 120 includes the degree of association between the related words, the related word acquisition unit 111 displays the word / phrase related to each search keyword included in the search information based on the degree of association. Obtain from 120. For example, the related phrase acquisition unit 111 acquires, from the dictionary storage unit 120, a phrase that has a degree of association with each search keyword included in the search information as a word or phrase related to each search keyword included in the search information.

  The low-related search phrase acquisition unit 112 acquires, from the dictionary storage unit 120, a phrase that is low or not related to each search keyword included in the search information (hereinafter referred to as a low-related search phrase). Specifically, the low-related search phrase acquisition unit 112 first acquires a phrase related to each search keyword included in the search information from the dictionary storage unit 120. Next, the low-related search phrase acquisition unit 112 repeats the process of acquiring the phrase related to the phrase acquired from the dictionary storage unit 120 from the dictionary storage unit 120 a predetermined number of times, and uses each search keyword included in the search information as a base point. Get a group of words to do. It should be noted that the predetermined number of times of repeating the process of acquiring the phrase related to the phrase acquired from the dictionary storage unit 120 from the dictionary storage unit 120 may be zero.

  Then, the low-related search word / phrase acquisition unit 112 acquires a low-related search word / phrase from the word / phrase excluding the related word / phrase group based on each search keyword included in the search information in the dictionary storage unit 120. Regarding the acquisition method, for example, a predetermined number of presets may be acquired in the order of acquisition, or a predetermined number may be acquired randomly using random numbers or the like. The low-related search phrase acquisition unit 112 repeats the process of acquiring the phrase related to the phrase acquired from the dictionary storage unit 120 from the dictionary storage unit 120 a predetermined number of times, so that the relationship with each search keyword included in the search information is more A low word can be acquired as a low related search word.

  When the dictionary storage unit 120 stores dictionary data in which words that are not related or are not related to each other are stored in the dictionary storage unit 120, the search data included in the search information from the dictionary data has a low relationship. Alternatively, words that are not related are acquired from the dictionary storage unit 120. In addition, when the degree of association between words related to the dictionary data in the dictionary storage unit 120 is included, the low-related search phrase acquisition unit 112 acquires a word / phrase with a low degree of association from the dictionary storage unit 120 as a low-related search word / phrase. To do. For example, a phrase having a relevance degree equal to or less than a predetermined value is acquired as a low-relevance search phrase, or a predetermined number of phrases are acquired as a low-relevance search phrase in descending order of relevance.

  In addition, the low-related search phrase acquisition unit 112 has a low-related relation such as a second low-related search phrase related to the acquired low-related search phrase and a third low-related search phrase related to the second low-related search phrase. A related phrase based on the search phrase may be acquired from the dictionary storage unit 120 as a low-related search phrase. By using low-related search phrases that include related words based on low-related search phrases in the generation of obfuscated search information, when a third party analyzes the obfuscated search information, the low-related search phrases and the low-related search phrases By extracting the linguistic tendency obtained from the related phrase as a base point and not extracting the linguistic tendency of the real search information, it becomes more difficult for a third party to leak the search information. Note that only low-relevance search terms may be used as low-relevance search terms.

  The search subject related phrase acquisition unit 113 acquires the phrase related to the search user information included in the search information from the dictionary storage unit 120. Here, the search user information is attribute information of the search user, for example, a company name or a school name to which the search user belongs, a business type of the search user, and the like. For example, when the company name to which the search user belongs is “KDDI Corporation”, “au”, “LISMO!”, And the like having a co-occurrence relationship are acquired from the dictionary storage unit 120. The search subject-related phrase acquisition unit 113 may acquire all the phrases related to the search user information included in the search information from the dictionary storage unit 120, or may acquire a preset number.

  Similarly to the related phrase acquisition unit 111, the search subject related phrase acquisition unit 113 may acquire a phrase related to each search keyword included in the search information from the dictionary storage unit 120 based on the relationship between the related phrases. Good. In addition, when the dictionary storage unit 120 also stores the degree of association between related words, the search subject-related word acquisition unit 113 searches based on the degree of association similarly to the related word acquisition unit 111. Words and phrases related to each search keyword included in the information can also be acquired from the dictionary storage unit 120.

  The low-related search subject phrase acquisition unit 114 acquires, from the dictionary storage unit 120, a phrase that has low or no relation to the search user information included in the search information. The specific processing of the low-relevance search subject phrase acquisition unit 114 is the same as that of the low-relevance search phrase acquisition unit 112, acquires a related phrase group based on the search user information included in the search information, and stores the dictionary The unit 120 acquires a low-relevance search subject word / phrase from a word / phrase excluding a related word / phrase group based on search user information included in the search information.

  When the dictionary storage unit 120 stores dictionary data in which words that are not related or not related are associated with each other, the dictionary storage unit 120 is similar to the low-related search word acquisition unit 112 and acquires a low-related search subject word / phrase. The unit 114 acquires, from the dictionary storage unit 120, words / phrases that are low or unrelated to the search user information included in the search information from the dictionary data. Further, when the degree of association between words related to the dictionary data in the dictionary storage unit 120 is included, it is the same as the low-related search word acquisition unit 112, and the low-related search subject word acquisition unit 114 is included in the search information. A phrase having a low degree of association with the information of the search user is acquired from the dictionary storage unit 120 as a low-related search phrase.

  The low-related search subject phrase acquisition unit 114 also includes a second low-relevance search subject phrase related to the acquired low-relevance search subject phrase and a third low-related search subject phrase related to the second low-relevance search subject phrase. For example, a related phrase based on the low-relevance search subject phrase may be acquired from the dictionary storage unit 120 as a low-relevance subject phrase.

  By using low-relevance search subject words and phrases that include related words from low-relevance search subject words as the starting point, the low-relevance search subject words and low-relationships are analyzed when a third party analyzes the obfuscation search information. By extracting the linguistic tendency obtained from the search subject word / phrase and related words / phrases and not extracting the linguistic tendency of the real search information, it becomes more difficult for a third party to leak the search information. Note that only words related to a low-related search subject word may be used as a low-related search subject word.

  The obfuscation search information generation unit 130 generates the obfuscation search information based on the obfuscation phrases acquired by the obfuscation phrase acquisition unit 110 and the search information. The obfuscated phrase includes at least one of a phrase related to the search keyword, a phrase that is low or unrelated to the search keyword, a phrase related to the search user, and a phrase that is low or not related to the search user. included.

  Specifically, the obfuscated search information generating unit 130, when the related phrase acquisition unit 111 acquires a phrase related to the search keyword as an obfuscated phrase, each search keyword is related to the obfuscated phrase, that is, each search keyword. The obfuscated search information is generated by substituting it with the words to be used. As a result of shifting the linguistic tendency of the search information by substituting with words related to each search keyword, the linguistic tendency of the obfuscated search information is different from the linguistic tendency of the search information, and the search information can be deceived by a third party.

  The obfuscated search information generation unit 130, when the low-related search phrase acquisition unit 112 acquires a phrase that is low or unrelated to the search keyword as an obfuscation phrase, combines the search keyword with the obfuscation phrase to obfuscate Generate search information. As a result of changing the linguistic tendency of search information by obfuscated words, which are words that are low or irrelevant to the search keyword, the linguistic tendency of the obfuscated search information is different from the linguistic tendency of the search information. Information can be deceived.

  When the search subject related phrase acquisition unit 113 acquires the phrase related to the search user as an obfuscated phrase, the obfuscated search information generation unit 130 generates the obfuscated search information by combining the search keyword and the obfuscated phrase. As a result of changing the linguistic tendency of search information by obfuscated words that are not related to the search keyword, the linguistic tendency of the obfuscated search information is different from the linguistic tendency of the search information, and the search information may be deceived by a third party. it can. In addition, since it is natural that the search user is interested in a word related to the search user, it is appropriate to use a phrase related to the information of the search user as an obfuscated word. In addition, when search information is leaked, it is also effective in increasing the accuracy of finding information leaks.

  The obfuscated search information generating unit 130 combines the search keyword and the obfuscated phrase when the low related search subject phrase acquiring unit 114 acquires a phrase that is low or unrelated to the search user as an obfuscated phrase. Generate obfuscated search information. As a result of changing the linguistic tendency of search information by obfuscated words, which are words that have low or no relation to the search keyword, the linguistic tendency of the obfuscated search information is different from the linguistic tendency of the search information. Can be deceived.

  If the words related to the search user are obfuscated words, the words related to the search user are determined as words for obfuscating the search information, and statistical analysis is performed except for the words related to the search user. May be performed. However, in the case of a phrase that has low or no relation to the search user, it cannot be determined whether the search user is interested in the phrase or the phrase to obfuscate the search information. Search information is more difficult to leak.

  The search unit 140 transmits a search query including the obfuscation search information generated by the obfuscation search information generation unit 130 to the search engine, and acquires a search result.

  FIG. 2 is a diagram showing a processing flow of the search information obfuscation method in the search information obfuscation apparatus according to the first embodiment of the present invention. The process starts when the search information included in the search query is acquired.

  First, in step S <b> 1, the obfuscated phrase acquisition unit 110 acquires an obfuscated phrase from the dictionary storage unit 120 based on at least one of the search keyword and the search user information included in the search information.

  Next, in step S2, the obfuscation search information generation unit 130 generates the obfuscation search information based on the obfuscated words and search information acquired in step S1.

  As described above, according to the present embodiment, the search information can be deceived by a third party by searching using the obfuscated search information having a language tendency different from the language tendency of the search information. As a result, it is possible to realize a secure Internet search that is difficult to leak search information to a third party.

<Second Embodiment>
A second embodiment of the present invention will be described with reference to FIG. Note that the search information obfuscation apparatus according to the present embodiment can statistically obfuscate the language tendency of the search information. In addition, about the component which attaches | subjects the same code | symbol as 1st Embodiment, since it has the same function, the detailed description is abbreviate | omitted.

<Search information obfuscation device>
FIG. 3 is a diagram illustrating a functional configuration of the search information obfuscation apparatus 101 according to the second embodiment of the present invention. The search information obfuscation device 101 is a device that obfuscates the language tendency of the search information included in the search query transmitted to the search engine in order to prevent the search information from leaking to a third party. Here, the search information is information composed of one or more search keywords and information of a user who performs a search (hereinafter referred to as a search user). As shown in FIG. 1, the search information obfuscation apparatus 101 includes an obfuscated word acquisition unit 110, a dictionary storage unit 120, an obfuscation search information generation unit 130, a search unit 140, a search content storage unit 150, and an obfuscation word number determination. Part 160.

  In the present embodiment, the search information obfuscation apparatus 101 includes the search unit 140, but the search information obfuscation apparatus 101 may not include the search unit 140. In this case, the search information obfuscation apparatus 101 acquires the search information included in the search query from another terminal, obfuscates the language tendency of the acquired search information, and sets the search information obfuscated by the language tendency to the other terminal. return.

  The search content storage unit 150 stores the search result content acquired by the search unit 140. Specifically, the search content storage unit 150 stores the search information, the obfuscated search information, and the content of the search result acquired by the search unit 140 in association with the obfuscation search information in association with each other.

  The obfuscation word number determination unit 160 first calculates the appearance frequency of the search information in the content based on the search information stored in the search content storage unit 150 and the content associated with the search information. . The appearance frequency of search information can be obtained as the sum of the appearance frequencies of search keywords constituting the search information. The appearance frequency of each search keyword is calculated by the following equation (1). The obfuscated word number determination unit 160 calculates the appearance frequency of the search information for each search information stored in the search content storage unit 150.

・・・（１）

... (1)

  Next, the obfuscated phrase number determination unit 160 acquires the number of obfuscated phrases included in each search information from the search information and the obfuscation search information stored in the search content storage unit 150. Next, the obfuscation word number determination unit 160 determines the number of obfuscation words based on the relationship between the appearance frequency of the search information and the number of obfuscation words calculated for each search information. For example, the obfuscated word count determining unit 160 acquires the smallest number of obfuscated words that is equal to or lower than a preset appearance frequency from the relationship between the appearance frequency of the search information and the number of obfuscated words, and includes it in the obfuscated search information. Determine the number of obfuscated words. Then, the obfuscated word number determination unit 160 transmits the obfuscation word number included in the determined obfuscation search information to the obfuscation search information generation unit 130.

  First, the obfuscated search information generation unit 130 receives the obfuscation phrases of the number of obfuscation phrases included in the search information received from the obfuscation phrase number determination unit 160 from the obfuscation phrases acquired by the obfuscation phrase acquisition unit 110. select. Regarding the selection method, for example, the number of obfuscation words may be acquired in the order of acquisition, or the number of obfuscation words may be acquired at random using a random number or the like. Then, the obfuscation search information generation unit 130 generates the obfuscation search information based on the selected obfuscation word and the search information. A specific method of generating the obfuscated search information is the same as that of the obfuscated search information generating unit 130 of the first embodiment.

  As described above, according to the present embodiment, by determining the number of obfuscated phrases included in the obfuscated search information used for the search according to the appearance frequency of the search information included in the content of the search result, Language trends can be statistically obfuscated. As a result, it is possible to arbitrarily set the difficulty of leaking search information, that is, the degree of confidentiality of search information.

<Third Embodiment>
A third embodiment of the present invention will be described with reference to FIG. Note that the search information obfuscation apparatus according to the present embodiment obfuscates the search information using words that are often used on the Web. In addition, about the component which attaches | subjects the same code | symbol as 1st Embodiment, since it has the same function, the detailed description is abbreviate | omitted.

  FIG. 4 is a diagram illustrating a functional configuration of the search information obfuscation apparatus 102 according to the third embodiment of the present invention. The search information obfuscation apparatus 102 obfuscates the language tendency of the search information included in the search query transmitted to the search engine in order to prevent the search information from leaking to a third party. Connected with. Here, the search information is information composed of one or more search keywords and information of a user who performs a search (hereinafter referred to as a search user). As shown in FIG. 1, the search information obfuscation apparatus 102 includes an obfuscation phrase acquisition unit 170, an obfuscation search information generation unit 130, and a search unit 140.

  The obfuscated word acquisition unit 170 acquires, as obfuscated words, words whose appearance frequency is higher than a predetermined value set in advance on the Web 200 among the words used on the Web 200. Specifically, a phrase whose appearance frequency in the content on the Web 200 is equal to or higher than a predetermined value is acquired as an obfuscated phrase. In addition, a phrase whose appearance frequency in a search log acquired from a search engine on the Web 200 is a predetermined value or more is acquired as an obfuscated phrase.

  As described above, according to the present embodiment, many users have a topic on the Web such as a common phrase or “search buzzword” on the Web regardless of the relationship with the search keyword. The search information can be deceived by a third party by obfuscating the linguistic tendency of the search information by using a phrase that is searched for. As a result, it is possible to realize a secure Internet search that is difficult to leak search information to a third party.

  Note that the search information obfuscation device of the present invention is realized by recording the processing of the search information obfuscation device on a computer-readable recording medium, causing the device to read and execute the program recorded on the recording medium. Can do. The computer system here includes an OS and hardware such as peripheral devices.

  Further, the “computer system” includes a homepage providing environment (or display environment) if a WWW (World Wide Web) system is used. The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line.

  The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, what is called a difference file (difference program) may be sufficient.

  The embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to the embodiments, and includes designs and the like that do not depart from the gist of the present invention.

DESCRIPTION OF SYMBOLS 100 Search information obfuscation apparatus 110 Obfuscation phrase acquisition part 111 Related phrase acquisition part 112 Low related search phrase acquisition part 113 Search subject related phrase acquisition part 114 Low related search subject phrase acquisition part 120 Dictionary storage part 130 Obfuscation search information generation part 140 Search part

Claims (8)

A search information obfuscation device that obfuscates language trends in search information related to Internet search from a third party,
Dictionary storage means for storing dictionary data indicating the relationship between words;
Related phrase acquisition means for acquiring a related search phrase related to a search phrase included in the search information as an obfuscated phrase from the dictionary storage means;
The process of acquiring the phrase related to the phrase acquired from the dictionary storage means from the dictionary storage means is repeated one or more times, and the low-relevance search phrase having low association with each of the acquired phrase groups is obfuscated from the dictionary storage means. Low-related search phrase acquisition means to acquire as a phrase;
Obfuscation search information generating means for generating obfuscation search information based on the obfuscated words acquired by the related phrase acquisition means and the low related search phrase acquisition means and the search information;
A search information obfuscation device comprising: The low-related search phrase acquisition unit acquires from the dictionary storage unit a low-related search phrase that is not related to the search phrase included in the search information, and acquires a phrase related to the acquired phrase from the dictionary storage unit The search information obfuscation apparatus according to claim 1, wherein the processing is repeated one or more times, and the acquired phrase group is acquired as the obfuscated phrase. Retrieval subject-related, wherein the obfuscated phrase acquisition unit acquires, as the obfuscated phrase from the dictionary storage unit, a search subject-related phrase that is related to search subject information that identifies the subject of the Internet search included in the search information With word acquisition means ,
3. The obfuscated search information generation unit generates the obfuscation search information by combining the obfuscated phrase acquired by the search subject-related phrase acquisition unit with the search information. Search information obfuscation device. Low-relevance search subject phrase acquisition means for acquiring a low-relevance search subject phrase that is not related to the search subject information included in the search information as the obfuscated phrase from the dictionary storage means,
4. The search information according to claim 3, wherein the obfuscation search information generation unit generates the obfuscation search information by combining the obfuscation word acquired by the low-related search subject word acquisition unit with the search information. Obfuscation device. The low-related search subject phrase acquisition unit repeats the process of acquiring a phrase related to the phrase acquired from the dictionary storage unit one or more times from the dictionary storage unit, and the low-related search subject related to each of the acquired phrase groups 5. The search information obfuscation apparatus according to claim 4 , wherein a phrase is acquired as the obfuscated phrase from the dictionary storage means . Search content storage means for storing content acquired by the Internet search using the obfuscated search information in association with the search information corresponding to the obfuscated search information;
Based on the content stored in the search content storage means and the search information associated with the content, the obfuscation included in the obfuscation search information based on the appearance frequency of the search terms included in the search information An obfuscation word number determination means for determining the number of word phrases;
Equipped with a,
The obfuscation search information generation means selects the obfuscation words to be included in the obfuscation search information from the obfuscation words based on the number of obfuscation words determined by the obfuscation word number determination means. The search information obfuscation apparatus according to any one of claims 1 to 5 . A search information obfuscation method in a search information obfuscation device that obfuscates a language tendency of search information related to Internet search from a third party,
The search information obfuscation device includes dictionary storage means for storing dictionary data indicating a relation between words, related word acquisition means, low related search word acquisition means, and obfuscation search information generation means,
A first step in which the related phrase acquisition unit acquires a related search phrase related to a search phrase included in the search information as an obfuscated phrase from the dictionary storage unit;
The low-related search phrase acquisition unit repeats the process of acquiring a phrase related to the phrase acquired from the dictionary storage unit from the dictionary storage unit one or more times, and the low-related search phrase that is low in relation to each of the acquired word groups A second step of acquiring from the dictionary storage means as the obfuscated phrase;
A third step in which the obfuscated search information generating means generates obfuscated search information based on the obfuscated words and the search information acquired in the first step and the second step;
A search information obfuscation method characterized by comprising: A program for causing a computer to execute a search information obfuscation method in a search information obfuscation device that obfuscates a language tendency of search information related to Internet search from a third party,
The search information obfuscation device includes dictionary storage means for storing dictionary data indicating a relation between words, related word acquisition means, low related search word acquisition means, and obfuscation search information generation means,
A first step in which the related phrase acquisition unit acquires a related search phrase related to a search phrase included in the search information as an obfuscated phrase from the dictionary storage unit;
The low-related search phrase acquisition unit repeats the process of acquiring a phrase related to the phrase acquired from the dictionary storage unit from the dictionary storage unit one or more times, and the low-related search phrase that is low in relation to each of the acquired word groups A second step of acquiring from the dictionary storage means as the obfuscated phrase;
A third step in which the obfuscated search information generating means generates obfuscated search information based on the obfuscated words and the search information acquired in the first step and the second step;
A program that causes a computer to execute.

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