| 摘要 |
PROBLEM TO BE SOLVED: To provide an information processor that prevents secret information processed inside thereof from being estimated from leak information such as a consumed current or the like. SOLUTION: The imformation processor includes: a key generation device for automatically generating key information; an encryption device for using the key information to encrypt data; a register for recording a plurality of encrypted data with the key information used to encrypt the data; and an arithmetic unit that receives the data expressed with the key information for the encryption and new key information, calculates them, encrypts the arithmetic result by the received new key and outputs the encrypted data. The image processing apparatus can process the data therein under an encrypted data expression. COPYRIGHT: (C)2006,JPO&NCIPI
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