| 摘要 |
<P>PROBLEM TO BE SOLVED: To dispense with an issuer to set a secret key taking into account an optimum encryption method for an IC card, and to set the secret key by converting to a key used for the optimum encryption method which is determined by the side of the IC card. <P>SOLUTION: When a secret key is given, an optimum encryption method is determined based on a speed of encryption processing, simplicity, or IC card specifications, and the secret key is set in the IC card by being converted to a key used for the optimum encryption method. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
