Method and a circuit for SHA operation with power saved

Details Method and a circuit for SHA operation with power saved Method and a circuit for SHA operation with power saved

2011-06-14

2011-06-14

Chen, Shin-Hon (Department: 2431)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C713S168000, C713S189000, C380S028000, C380S030000

Reexamination Certificate

active

07962753

ABSTRACT:
A Secure Hash Algorithm (SHA) operation circuit includes plural storages for storing the variables of the SHA calculation, a permutation section for permuting the output signals of the storages, and an arithmetic unit for calculating a temporary value by the use of the output signals of the storages and a data segment successively extracted from input data from which the hash value is to be obtained. When each data segment is processed, some of the storages are supplied with no clock signal and thereby maintain the values stored therein without change. The SHA operation circuit is thus capable of saving power.

REFERENCES:
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patent: 7403614 (2008-07-01), Sato
patent: 2002/0066014 (2002-05-01), Dworkin et al.
patent: 2004/0260740 (2004-12-01), Liu
patent: 2002-287635 (2002-10-01), None
patent: 2004-240298 (2004-08-01), None

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