| 摘要 |
<P>PROBLEM TO BE SOLVED: To complicate specification of timing of encryption processing, or sensitive processing for a portion handling important data or the like in processing of an IC card. <P>SOLUTION: A watchdog timer circuit 403 is provided for carrying out CPU interruption after passage of a predetermined time, and a random number generating means 402 is provided for generating a random number. By a random number generated by the random number generating means, a timer value of the watchdog timer circuit is set, operation of the watchdog timer circuit is started, and dummy processing is carried out for a predetermined time at the stage of carrying out interruption by the watchdog timer circuit. <P>COPYRIGHT: (C)2007,JPO&INPIT |
