| 摘要 |
PROBLEM TO BE SOLVED: To provide an encryption processing apparatus which shortens processing time while ensuring resistance to a power analysis attack. SOLUTION: The encryption processing apparatus 1 has first and second round function operational circuits 27a, 27b for respectively executing encryption processing, and a control circuit 30 for randomly switching a parallel operation mode (PM) for allowing the first round function operational circuit 27a and the second round function operational circuit 27b to operate in parallel and a serial operation mode (SM) for allowing the first round function operational circuit 27a and the second round function operational circuit 27b to operate in series to allow the first round function operational circuit 27a and the second round function operational circuit 27b to operate. COPYRIGHT: (C)2011,JPO&INPIT
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