| 摘要 |
PROBLEM TO BE SOLVED: To provide a game system for securing secrecy in data communications by making it difficult to decode enciphered data exchanged between a game recording medium processor (a card unit) and a game recording medium management device (a terminal box) even when the data are intercepted. SOLUTION: The terminal box generates a first public key code (a public key 1 and a secret key 1) and a second public key code (a public key 2 and a secret key 2), stores the secret key 1 and the public key 2 and transmits the public key 1 and the secret key 2 to the card unit. Then the card unit stores the public key 1 and the secret key 2. The card unit and the terminal box encipher transmission data through the use of the public keys and decode reception data by using the respective secret keys corresponding to the public keys. COPYRIGHT: (C)2003,JPO
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