CN1477523A - Method for recording and reproducing compacted voice file by using decryption key - Google Patents
Method for recording and reproducing compacted voice file by using decryption key Download PDFInfo
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- CN1477523A CN1477523A CNA021345945A CN02134594A CN1477523A CN 1477523 A CN1477523 A CN 1477523A CN A021345945 A CNA021345945 A CN A021345945A CN 02134594 A CN02134594 A CN 02134594A CN 1477523 A CN1477523 A CN 1477523A
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Abstract
The present invention relates to a deciphering key recording and reproducing method for compressed voice file, and is aimed at protecting copyright. The method mainly includes the following steps: the deciphering keys of cryptographically-recorded MP3 compressed voice file are dispersedly recorded on the mark information, at the same time on the player like MP3 playing machine the deciphering keys which are dispersedly recorded on the mark information can be delected and combined. The method can prevent the enciphered MP3 voice file from being played by using general player.
Description
(1) technical field
Record and reproducting method are built in the deciphering that the present invention relates to a kind of compacted voice file.The means of its decryption key that refers in particular to understanding as the voice data of encrypted record in the same compacted voice file of MP3 audio file compatibly is additional to MP3 audio file record format, it is detected at the player the same with the MP3 player, is to belong to compacted voice file record that can be decrypted and the method for reproducing.
(2) background technology
At first, referring to Fig. 1, shown in Figure 1 is, existing MP3 audio file record format, possess the collector title (Header) of 4 bytes (4B) regular length and arbitrarily variable-length framework (Frame) at least more than one comprise and be recorded in the above-mentioned MP3 audio file, the information of above-mentioned MP3 audio file, as, comprise the collector title of record, sleeve for phonograph record, the label information of 128 bytes that the various information such as date and type of making are writing down to the MP3 audio file.
In said frame information, voice data is compressed record by " MPEG Audio3 " compress mode.In above-mentioned collector heading message; be included as and overlap and the synchronous frame lock bit of frame data; for distinguishing the amplitude modulation audio version ideal bit of amplitude modulation assembling versions of data; check that according to error code data pass on whether wrong safeguard bit; the bit rate index bit of data discrimination stream bit rate; for filling the filler of empty data; make the private position of user's appointment at random; for showing the passage form bit of stereo channel or binary channels form etc.; when the stereo channel mode, can be for showing the form expansion position of frequency band; for showing copyright protection whether copyright position; for showing manifolding or whether initial initial bit; also have emphasis position etc. writing down.
Then, at player as the MP3 player, the retrieval playback record is in 128 byte flag information of MP3 audio file, allow the user confirm the various information of relevant document, when demonstrating picture by LCD etc., utilize the information of above-mentioned collector record that heading message comprises, packed record is restored and reproduces output and carry out a series of reproduction operation at the voice data in the framework territory voice data with high tone quality.
Now, with above-mentioned same, the player that the MP3 audio file is restored and will reproduce the MP3 phonograph etc. of output with the voice data of high tone quality spreads widely, when popularizing, along with above-mentioned MP3 audio file provides the internet to come on stage successively by the Internet without authorization.Reality is told us, presses for the scheme that the copyright of above-mentioned MP3 audio file is protected.
Then, be recorded in the audio compressed data in the frame zone of above-mentioned MP3 audio file, the cipher mode that utilization is known together is read and is carried out packed record after the solo mode is enciphered, that decryption key is only in the player of storing, the MP3 audio file is decrypted with original voice data and restores, refresh, and decryption key can prevent its unauthorized duplication, reproduce the MP3 audio file at any player of not stored as yet.
But, above-mentioned decryption key is, in making MP3 audio file enciphering recording process, because the wright just can specify use with the mutual incoherent key assignments of formulating, so possess as the user of the player of MP3 player facing to the problem that will will be stored at entirely the decryption key separately of many MP3 audio files of encrypted record as the storage of MP3 phonograph.
(3) summary of the invention
The present invention creates in order to address the above problem.In order to protect copyright; the MP3 audio file decryption key dispersed record that makes the record of enciphering is in MP3 audio frequency collector heading message; at player as the MP3 player; detect and make up the decryption key of dispersed record in above-mentioned collector heading message; for understanding makes it scrambled record in the compacted voice file of the deciphering of audio compressed data and recovery,, decryption key record and reproducting method thereof be its purpose so that being provided.
For achieving the above object, recording method is to carry out the recording method of compacted voice file decryption key with a plurality of collector title portions and frame section to comprise according to compacted voice file decryption key of the present invention:
The first step receives the reproduction application of compacted voice file;
Second step, the label information of the collector title portion of the storage decryption key of retrieval, affirmation compacted voice file;
The 3rd step, to search between the recording areas of compacted voice file decryption key of above-mentioned reproduced application, the decryption key dispersed record is the collector title portion in zone in front.
According to the decryption key of compacted voice file of the present invention record and reproducting method, finish compacted voice file with a plurality of collector titles and framework and carry out reproducting method and comprise:
The first step is extracted the means of its decryption key that dispersed record is stored in above-mentioned collector heading message;
In second step, make up above-mentioned means of its decryption key of extracting, and finish decryption key;
The 3rd step, utilize above-mentioned decryption key, the compacted voice file of above-mentioned encryption is decoded, carry out exporting the reproduction compacted voice file after the Audio Signal Processing.
Effect of the present invention: the decryption key record and the reproducting method thereof of compacted voice file of the present invention; be in order to protect copyright; will be to the decryption key of the MP3 audio file of scrambled record; dispersed record is in label information; on player, dispersed record is detected at the decryption key of above-mentioned label information, makes up as MP3 player machine.Because carrying out the deciphering and the recovery of the audio compressed data of encrypted record reproduces, so the MP3 audio file is being carried out in the process of scrambled record, the wright will ownly specify the intrinsic decryption key that uses arbitrarily, not need specially to be stored in the player as the MP3 player.In addition,, protect, can prevent that encrypted MP3 audio file is in this player plays in order to protect version to the general player that does not possess algorithm (computation sequence) that dispersed record is detected and makes up at the decryption key of label information.
For further specifying above-mentioned purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.
(4) description of drawings
Shown in Figure 1 is the record format of the MP3 audio file of one of existing compacted voice file;
The present invention that shown in Figure 2 is to an embodiment decryption key by the pie graph of the MP3 audio file of dispersed record;
The present invention that shown in Figure 3 is to another embodiment decryption key by the pie graph of the MP3 audio file of dispersed record;
The structural drawing that shown in Figure 4 is to the MP3 player that is applicable to the compacted voice file reproducting method;
Shown in Figure 5 is the process flow diagram of the present invention to the compacted voice file reproducting method.
(5) embodiment
Below,, be elaborated to the embodiment of compacted voice file decoding key record method and reproducting method according to the present invention with reference to accompanying drawing.
Referring to Fig. 2, the present invention that shown in Figure 2 is to an embodiment decryption key by the pie graph of the MP3 audio file of dispersed record.
With reference Fig. 1 stated like that, in the MP3 audio file, comprise writing down the regular length collector title that possesses 4 bytes and possess at random " variable-length " frame at least more than one, comprise and writing down 128 byte flag information that above-mentioned MP3 audio file is being write down.
According to the present invention according to the decryption key method, the audio compressed data of at above-mentioned frame territory recording of encrypted, to carry out dispersed record for the decryption key of deciphering in several collector header records of being write down by the front region of MP3 audio file, particularly, be recorded in separately in the collector heading message, make the user at random specify the private position of using defined " 1 " bit long.Among Fig. 2 when decryption key is " 0101 ", the private position of 4 collector heading messages (Header1,2,3,4), write down " 0 ", " 1 ", " 0 ", " 1 " separately, at corresponding with above-mentioned the 1st collector heading message framework, the reference information of relevant decryption key is selected record with non-encrypted data, make it to shorten the total length of MP3 audio file.
Referring to Fig. 3, the present invention that shown in Figure 3 is to another embodiment decryption key by the pie graph of the MP3 audio file of dispersed record.When decryption key is " 0101 ", private position in 4 the collector heading messages (Header1,2,3,4) that write down by MP3 audio file front region, write down " 0 ", " 1 ", " 0 ", " 1 " separately, again, at corresponding with above-mentioned the 4th collector heading message framework, the reference information of relevant above-mentioned decryption key is selected record with non-encrypted data, make it to shorten the total length of MP3 audio file.
Fig. 4 is the structural drawing that the compacted voice file reproducting method is applicable to the MP3 player according to the present invention, and this MP3 player comprises: several MP3 audio files are recorded memory storing 10; According to user's application, read, be recorded in the MP3 audio file of above-mentioned storer 10, detect and the microprocessor 20 of combination decryption key; Utilization when the decryption key of above-mentioned microprocessor 20 detected combinations is decrypted operation, with above-mentioned decrypted audio compressed data, the deciphering of deciphering with original voice data and the storer 40 of translator; The voice data of above-mentioned deciphering and decoding is handled, and the audio signal processor 30 of reproducing audio signal; For LCD 50 grades of a series of information of showing aforesaid operations constitute.In addition, above-mentioned deciphering and translator storer 40 can comprise with one and be formed in the above-mentioned microprocessor.
Shown in Figure 5 is the operational flowchart (simultaneously referring to Fig. 4) of 20 pairs of compacted voice file reproducting methods of described microprocessor.
S10, when the user receives the reproduction application of relevant MP3 audio file, search record, be stored in any one MP3 audio file of storer 10, retrieve, store, be recorded in the trailer label information of the relevant MP3 audio file of application reproduction, comprise the fileinfo that is recorded in this label information, as, about the various information such as collector title, sleeve for phonograph record, making date and type of MP3 audio file;
S11 on the one hand by LCD 50 display frames, detects and confirms the label information of MP3 audio file on the one hand, the information of decryption key whether dispersed record in the shown information that goes out of several places label information;
S12 searches between the recording areas of MP3 audio file of above-mentioned reproduced application, is recorded in the collector heading message of front region, as, Fig. 2 and shown in Figure 3, decryption key dispersed record then detect the 1st and even the 4th collector heading message when 4 collector heading messages;
S13, at microprocessor 20, at first, and retrieval, the copyright position that copyright protection is showed in affirmation, whether the bit value of copyright protection " 1 " is recorded in the copyright position of the above-mentioned the 1st and even the 4th collector heading message;
S14 differentiates the result of above-mentioned affirmation, whether promptly differentiates the copyright position=" 1 ", if not=" 1 ", then enters following S18 flow process;
S15, if when the copyright position is " 1 ", microprocessor 20 is retrieved dispersed record and store at the decrypted value of the private position of the 1st to the 4th collector heading message;
S16, " 0101 " of the decrypted value that is retrieved, stores being made up and finishing means of its decryption key;
S17 utilizes by making up the decryption key of finishing with above-mentioned the same process, understands and be stored in the decrypted program of translator storer 40, understands separately scrambled record at the voice data in frame district;
S18 utilizes the translator of the storer 40 be stored at above-mentioned deciphering and translator, with decrypted audio compressed data, restores and is output in audio signal processor 30 with original voice data.
S19 is at above-mentioned audio signal processor 30, with above-mentioned deciphering and the voice data that restored, carries out signal Processing with reproducing audio signal, and carries out the normal reproduction signal processing operations that reproduces output.
Above-mentioned affirmation result; when on above-mentioned copyright position, write down be " 0 " time; the copyright protection that can be characterized as the MP3 audio file is not set up as yet; just omitted and above-mentioned same decryption key testing process and decrypting process; and utilize above-mentioned translator; with audio compressed data, to restore with original voice data, the line output of going forward side by side is in the operation of Audio Signal Processing portion 30.
Then, with above-mentioned the same, from the collector heading message decryption key be limited in as detect, the player of MP3 player that the algorithm algorithm of combination is possessed, with the MP3 audio file of encrypting, reproduce (broadcasts) with normal high tone quality voice data and export.
Above-mentioned embodiments of the invention are to create for the purpose of indication.Above-mentioned encryption and decrypting process are to rely on to finish as the diversified cipher mode of reading the solo mode.Can both understand this reason as the operator.Therefore, omit relevant explanation here, also have the present invention can enlarge to be applied to MP3 audio file another compacted voice file in addition etc.
Certainly, those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claims of the present invention variation, the modification of the above embodiment.
Claims (9)
1. the decryption key of compacted voice file record and reproducting method carry out the recording method of compacted voice file decryption key with a plurality of collector title portions and frame section, it is characterized in that described method comprises:
The first step receives the reproduction application of compacted voice file;
Second step, the label information of the collector title portion of the storage decryption key of retrieval, affirmation compacted voice file;
The 3rd step, to search between the recording areas of compacted voice file decryption key of above-mentioned reproduced application, the decryption key dispersed record is the collector title portion in zone in front.
2, the decryption key of compacted voice file as claimed in claim 1 record and reproducting method is characterized in that described decryption key is to be recorded in described collector title portion mark zone.
3, the decryption key of compacted voice file as claimed in claim 1 record and reproducting method is characterized in that described frame section records the additional reference information to packed data.
4, the decryption key of compacted voice file as claimed in claim 3 record and reproducting method is characterized in that described collector title portion comprises that decryption key has mark zone not.
5, the decryption key of compacted voice file as claimed in claim 1 record and reproducting method, it is characterized in that described decryption key be comprise the bulletin decryption key whether dispersed record in the information of several heading messages.
6. the decryption key of compacted voice file record and reproducting method are finished compacted voice file with a plurality of collector titles and framework and are carried out reproducting method, it is characterized in that described method comprises:
The first step is extracted the means of its decryption key that dispersed record is stored in above-mentioned collector heading message;
In second step, make up above-mentioned means of its decryption key of extracting, and finish decryption key;
The 3rd step, utilize above-mentioned decryption key, the compacted voice file of above-mentioned encryption is decoded, carry out exporting the reproduction compacted voice file after the Audio Signal Processing.
7, the decryption key of compacted voice file as claimed in claim 6 record and reproducting method, when it is characterized in that decryption key is extracted decryption key in the described step 1 in several collector heading messages of dispersed record, also comprise from label information and retrieving, confirm decryption key.
8, the decryption key of compacted voice file as claimed in claim 6 record and reproducting method is characterized in that described means of its decryption key is the mark zone that is recorded in collector title portion.
9. the decryption key of compacted voice file as claimed in claim 6 record and reproducting method is characterized in that described demonstration decryption key has information not to be recorded in the mark zone of collector title portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021345945A CN1477523A (en) | 2002-08-19 | 2002-08-19 | Method for recording and reproducing compacted voice file by using decryption key |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021345945A CN1477523A (en) | 2002-08-19 | 2002-08-19 | Method for recording and reproducing compacted voice file by using decryption key |
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| Publication Number | Publication Date |
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| CN1477523A true CN1477523A (en) | 2004-02-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA021345945A Pending CN1477523A (en) | 2002-08-19 | 2002-08-19 | Method for recording and reproducing compacted voice file by using decryption key |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100385422C (en) * | 2005-06-21 | 2008-04-30 | 达智科技股份有限公司 | Encryption and Decryption Methods of MP3 Files |
-
2002
- 2002-08-19 CN CNA021345945A patent/CN1477523A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100385422C (en) * | 2005-06-21 | 2008-04-30 | 达智科技股份有限公司 | Encryption and Decryption Methods of MP3 Files |
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