Information processing device

Details Information processing device Information processing device

2007-04-10

2007-04-10

Nguyen, Kimberly D. (Department: 2876)

Registers

Records

Conductive

C235S375000, C235S380000

Reexamination Certificate

active

10745540

ABSTRACT:
An object of the present invention is to prevent secret information that is being internally processed from being inferred through operational information of a secured device, including the current consumption information. One solution is provided by an information processing device having at least a key generation apparatus that generates key data automatically, an encryption unit that encrypts data with the corresponding key data, a register that stores a plurality of encrypted data items with the corresponding encryption key data items, and an arithmetic unit that performs operations using data expressed with the corresponding encryption key data and new key data as the input, encrypts the operation result with new input key data, and outputs the result, thereby being capable of performing internal processing on an encrypted data expression. Accordingly, only encrypted data is transferred on the internal or external data bus line.

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“Security Methods” The Smart Card Handbook, pp. 262-265.

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