JP3722345B2 - How to set the secret communication method of the secret communication device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is applied to, for example, a wireless mobile mobile station, and in particular, the function of the communication device can be changed by changing the software module stored in the software module storage means, and the communication device has a secret communication method for performing secret communication. It relates to the setting method.
[0002]
[Prior art]
By using a DSP (Digital Signal Processor), it is possible to realize functions such as a modulator / demodulator and a filter of a wireless communication device by software (Document J. Mitola, III “The Software Radio Architecture”, IEEE Comm. Mag. Vol33, No.5, pp.26-38, 1995).
[0003]
Therefore, the user can change functions such as a modem of a wireless communication device, a synthesizer, a voice codec, a communication protocol, an authentication / secret algorithm, and an authentication algorithm by changing the software module.
In the conventional method, as shown in FIG. 7, when a software module used by a user is input through a man-machine interface 111, the software module is stored in software module storage means 118, and wireless communication execution means 119 composed of DPS by the software module. The carrier wave is modulated by the input signal, and the modulated signal is encrypted by the encryption / decryption means 804 by the secret software module of the secret software module execution means 810 and wirelessly transmitted by the transmission / reception means 114, The signal received by the transmission / reception means 114 is decrypted by the encryption / decryption means 804 and further demodulated by the wireless communication execution means 119 and output. The secret software module execution means 810 operates only with one type of secret software module stored in the secret software storage means 808.
[0004]
Further, the secret software module execution means 810 and the encryption / decryption means 804 are separate means. The secret software module execution means 810 has a function of determining a scramble pattern, and the encryption / decryption means 804 It had a function to execute exclusive OR with data. Also, the encryption / decryption means 804 is configured by hardware and cannot be updated.
[0005]
[Problems to be solved by the invention]
In the above conventional method, the scramble pattern generating means, that is, the secret software module executing means 810 can be updated, but the encryption / decryption means 804 cannot be updated. There was a problem that it was difficult to change to. There is also a problem that it is difficult to use a plurality of secret software modules having different encryption strengths as required. In other words, a normal conversation may be a scrambled cipher whose encryption strength is not so strong, but it has not been possible to use a public key cryptosystem with a strong encryption strength for electronic commerce communication.
[0006]
An object of the present invention is to provide a secret communication method setting method of a secret communication device that can implement a more secure encryption and can use a plurality of secret software modules having different encryption strengths.
[0007]
[Means for Solving the Problems]
According to the present invention, the secret software module to be used is automatically determined. In other words, the secret software module corresponding to the secret level is determined by the software module of the communication or software application used, or the secret software module is determined according to the input secret level, and the determined secret software module is selected. Are stored in the software module storage means, and the secret software module is executed by the communication execution means. Information indicating the determined secret software module is transmitted to the partner communication device. Therefore, encryption and decryption are performed by the same secret software module in the partner communication device, and secret communication is possible.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a configuration example of a communication system to which the present invention is applied. The wireless communication terminal 11 can change the function of the wireless communication device by changing the software module, the wireless base station 12, and the wireless communication system including the network 13.
The network 13 accommodates a plurality of secret software modules ranked by encryption strength, and transmits the secret software modules to the wireless communication terminal 11 via a wireless line or a wired line in response to a request from the wireless communication terminal 11. And a network terminal station 15 to which the wireless communication terminal 11 can be connected, for example, via a connector. The wireless communication terminal 11 communicates with the software module server 14 via the network terminal station 15. Can be possible.
[0009]
As shown in FIG. 2A, the base station 12 includes a wireless transmission / reception unit 121, a wireless communication execution unit 122, and a network interface 123.
As shown in FIG. 2B, the wireless communication terminal 11 has a wired communication means via a man-machine interface 111 having a function of inputting a request from a user and outputting a response signal to the user, and a network terminal station 15. The wired communication execution means 112 that supports the function of downloading various software modules with the software module server 14 and inputting the user's request conditions via the man-machine interface 111, and executing the wired communication A network interface 113 that enables communication by means of wired connection via the network terminal station 15; a wireless transmission / reception means 114 that performs transmission / reception with the base station 12 wirelessly; an IC card that stores a secret software module; Removable software module storage medium 115 such as DROM, software module storage medium reading means 116 for reading the software storage medium, a plurality of secret stories ranked by encryption strength received via a wireless line or a wired line, or a storage medium Software module storage means 117 such as a hardware disk for storing the software module, software module received from the software module server 14 via the wireless line or wired line, from the storage medium 115, or from the software module storage means 117 is immediately executed. Software module storage means 118 such as a computer RAM for storing in a possible form, software stored in the software module storage means 118 Wireless communication performing unit 119 a module executed immediately, supporting a wireless communication function with the base station,
A function to determine the secret software module to be used according to the user's request or the secret level of the software application to be used, and a function to determine the secret software module to be used from the secret software module information received via a wired or wireless line And a secret software module selection unit 121 having a function of transmitting the determined secret software module information to the other user and requesting the determined secret software module from the software module storage means, the software storage medium, and the software module server. .
[0010]
A more specific description of the wireless communication terminal 11 will be described with reference to FIG. In FIG. 3, the same numbers are assigned to portions corresponding to FIG. 2B.
The wireless communication terminal 11-1 owned by the user 1 determines the necessary secret software module by the secret software module selection unit 121 by inputting the secret level required by the user through the man-machine interface 111, and the software module storage unit. 117, requests the software module storage medium 115 or the software module server 14 in this order, receives the secret software modules, stores them in the software module storage means 118 of the own terminal, and the wireless communication terminal 11-2 of the user 2 Is notified by wireless communication of the secret software module information to be used.
[0011]
The wireless communication terminal 11-2 owned by the user 2 obtains the secret software module required by the secret software module selection means 121 based on the secret software module information to be used received via the wireless communication. The software module storage medium 115 or the software module server 114 is requested and received, the secret software module is stored in the software module storage means 118, and thereafter desired communication and software application (for example, electronic commerce) are executed.
[0012]
In the present invention, any method may be used for the form of the request unit for the secret story software module and the download means for transmitting / receiving the secret story software module.
FIG. 4 shows an operation flow of the configuration shown in FIG. When the user 1 inputs the secret level required by the user through the man-machine interface 111 of the wireless communication terminal 11-1 (S 1), the secret software module corresponding to the secret level is automatically selected by the secret software module selection unit 121. The information indicating the determined secret software module is transmitted to the counterpart wireless communication terminal 11-2 via wireless communication (S3).
[0013]
On the other hand, in the wireless communication terminal 11-1, the determined secret software module is requested to the software module storage means 117 (S4), and if the secret software module does not exist in the software module storage means 117 (S5), The determined secret software module is requested from the software module storage medium 115 (S6). If the secret software module does not exist in the software module storage medium 115 (S7), the secret software module is requested from the software module server 14. (S8).
[0014]
If the secret software module exists in the software storage means 117 in step S5, the secret software module is extracted (S9), and the secret software module is stored in the software module storage means 118 (S12). If the secret software module exists in the software module storage medium 115 in step S7, this is extracted (S9), and since it is not from the storage means 117 (S10), it is stored in the software module storage means 117 (S11) and the software. It is stored in the module storage means 118 (S12). Similarly, the secret software module ordered from the software module server 14 is stored in the software module storage unit 117 (S11) and stored in the software module storage unit 118 (S12).
[0015]
On the other hand, when the information indicating the secret software module used (determined) used (determined) is received by the wireless communication terminal 11-2 via the wireless line (S21), the secret software module selection means 121 within the wireless communication terminal 11-2. A secret software module is determined (S22). Similarly to the processing in the wireless communication terminal 11-1, first, it is checked whether the used secret software module is in the software module storage means 117 (S23). If not (S24), the software module If the storage medium 115 is checked (S25), if not (S26), a request is made to the software module server 14 (S27). If the used secret software module is obtained, it is extracted (S28) and stored in the software module storage means 117. Memorize (S30) and software Accumulate E A module storage unit 118 (S31).
[0016]
In this way, the software module storage means 118 of each of the wireless communication terminals 11-1 and 11-2 stores the secret software module of FIG. 1 corresponding to the required secret level, so that both the wireless communication terminals 11- In each of the wireless communication execution means 119 of 1 and 11-2, encryption and decryption are performed by the same encryption method, and secret wireless communication is executed between the wireless communication terminals 11-1 and 11-2.
[0017]
The setting of the secret software module can also be performed as shown in FIGS. 5 and 6 by attaching the same reference numerals to the portions corresponding to FIGS. 3 and 4, respectively. Only portions different from those in FIGS. 3 and 4 will be described. That is, when the wireless communication terminal 11-1 owned by the user 1 inputs a software module (such as a conversation or a software application) used by the user through the man-machine interface 111, the secret software module selection unit 121 responds to the software module used. The secret software module at the secret level is determined, the requested software module storage means 117, the software module storage medium 115, or the software module server 14 receives the secret software module after request and stores it in the software module storage means 118 of its own terminal. The user 2's wireless communication terminal 11-2 is notified of the secret software information to be used by wireless communication.
[0018]
The wireless communication terminal 11-2 owned by the user 2 performs the same processing as in FIGS. Depending on the software module used, for example, the scramble encryption method is relatively weak in the case of conversation (the secret level is not high), the block encryption method in the case of e-mail, and the encryption strength in the case of e-commerce. These may be tabulated so that it is decided to use a strong (high secret level) public key cryptosystem.
[0019]
In the above description, since the wireless communication terminal 11-1 may be a receiving terminal, the wireless communication terminal 11-1 naturally has the function of the wireless communication terminal 11-2. The present invention can be applied not only to a wireless communication device but also to a wired communication device.
[0020]
【The invention's effect】
As described above, according to the present invention, only the secret software module necessary for communication is used in the software module storage unit as necessary by using the configuration of the software module storage unit that stores software that can be executed immediately in the software module execution unit. The secret terminal software module of the required secret story level is used based on the secret story level input by the user or the application used by the communication terminal, and the information of the secret software module is stored in the wireless communication terminal of the other user. The secret software module of the secret story level required by both parties is accumulated, and then the desired communication and application are executed.
[0021]
This makes it possible to implement a more secure cipher that was impossible in the past, and to provide a communication device that can use multiple secret software modules with different cipher strengths. Convenience for private communication of business operators and users is improved.
[Brief description of the drawings]
FIG. 1 is a diagram showing a concept of a wireless communication system.
2 is a diagram showing functional configurations of a base station and a wireless communication terminal in FIG.
FIG. 3 is a block diagram showing a functional configuration of a wireless communication terminal to which the present invention is applied.
4 is a diagram showing an operation flow of the terminal of FIG. 3;
FIG. 5 is a block diagram showing a functional configuration of another wireless communication terminal to which the present invention is applied.
6 is a diagram showing a flow of operation of the terminal in FIG. 4;
FIG. 7 is a block diagram showing a functional configuration of a conventional wireless communication terminal.

Claims (2)

A secret communication method setting method for a secret communication device capable of changing the function of the communication device by changing the software module stored in the software module storage means,
A secret software module determination process in which the secret software module to be used is determined by the secret software module selection means according to the input secret story level or the software module to be used.
A process of transmitting information indicating the secret software module to the partner communication device,
A first software module request process for requesting the determined secret software module from software module storage means such as a hardware disk in the communication device;
A first determination step of determining whether the requested secret software module exists in the software module storage means;
If the determination of the first determination process does not exist, a second software module requesting the determined secret software module from a software module storage medium such as an IC card or a CDROM detachably attached to the communication device Software module request process,
A second determination process for determining whether the requested secret software module exists in the software storage medium;
If the determination of the second determination process does not exist, the selection process of selecting the secret software module by the third software module request process for requesting the determined secret software module from the external software module server is provided. And
The selected privacy software modules and accumulation process of accumulating a said software module storing means,
A third determination process for determining whether the secret software module stored in the storage means is from the software module storage means;
If the determination in the third determination process is negative, the storage module stores the selected secret software module in the software module storage means.
How to set the secret communication method of the secret communication device. A process of receiving information indicating the secret software module to be used from the partner communication device;
  When the information is received, the received secret software module is used as the determined secret software module, and the selection process, the accumulation process, the third determination process, and the storage process are executed. The method for setting the secret communication method of the secret communication device according to claim 1.

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