Confidential information processing apparatus, confidential...

Cryptography – Communication system using cryptography – Data stream/substitution enciphering

Reexamination Certificate

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Details

C380S030000, C380S255000, C380S259000, C380S277000, C713S158000, C713S175000, C713S182000, C713S187000, C713S189000, C726S027000

Reexamination Certificate

active

08077867

ABSTRACT:
The present invention relates to a confidential information processing device, a confidential information processing apparatus, and a confidential information processing method, and particularly to a confidential information processing device which performs multiple cryptographic computation for different target data included in a data stream. With this configuration, the context control unit outputs the stream on which the cryptographic computation is performed to an external device or other stream analysis unit. Thus, by setting the number of cryptographic computation on a correspondence table, the number of computation can be set to any number. Thus, the confidential information processing device according to the present invention can perform any number of cryptographic computations on one stream. Furthermore, without outputting the stream whenever a cryptographic computation is completed, multiple cryptographic computations can be performed with one stream input. In addition, by setting the number of cryptographic computation on the correspondence table, the number of computation can be easily changed.

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English language Abstract of JP 2006-41684.
U.S. Appl. No. 11/912,422 to Shimizu et al., which was filed on Oct. 24, 2007.

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