| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a technique capable of preventing unauthorized decryption for the information processing apparatus including encryption operation process. Ž<P>SOLUTION: A reconfiguration enable circuit (RECONF) 107 includes a plurality of equivalent logic circuits corresponding to one encryption processing algorithm, a random number generator, and a switch. The switch switches the plurality of equivalent logic circuits, based on a random number generated at the random number generator. A CPU 106 configures a logic circuit in the reconfiguration enable circuit 107 based on a configuration information stored at a ROM 112, and performs encryption operation process. A circuit for performing encryption operation processing for data actually is changed at random when the processing is performed, so that it is difficult to identify the circuit which actually performs the processing even if the configuration information is read. Thereby, unauthorized decryption using known power consumption analysis and/or timing analysis can be prevented. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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