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SHARED KEY GENERATING METHOD, SHARED KEY GENERATING SYSTEM, ENCRYPTED DATA COPYING METHOD, SHARED KEY GENERATING PROGRAM, ENCRYPTED DATA TRANSMISSION PROGRAM, AND ENCRYPTED DATA RECEPTION PROGRAM
SHARED KEY GENERATING METHOD, SHARED KEY GENERATING SYSTEM, ENCRYPTED DATA COPYING METHOD, SHARED KEY GENERATING PROGRAM, ENCRYPTED DATA TRANSMISSION PROGRAM, AND ENCRYPTED DATA RECEPTION PROGRAM
PROBLEM TO BE SOLVED: To provide a shared key generating method whereby danger of leakage of a shared key used for encrypting data is less.;SOLUTION: The shared key generating method is used by a terminal A being a small-sized communication terminal such as a mobile phone with high tamper resistant performance and by a terminal B such as a PC with low tamper resistant performance. The terminal A generates a partial key Kp by using a key generating function F1 on the basis of terminal information unique to the terminal. Succeedingly, the terminal A generates the shared key K by using a key generating function F2 on the basis of the generated partial key Kp and a private key Kc and encrypts/decrypts the data by using the generated shared key K. On the other hand, the terminal A transmits the generated partial key Kp to the terminal B. When receiving the partial key Kp, the terminal B generates the shared key K on the basis of a private key Kc_2 shared with the terminal A and the partial key Kp.;COPYRIGHT: (C)2007,JPO&INPIT
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