Generating message digests according to multiple hashing...

Details Generating message digests according to multiple hashing... Generating message digests according to multiple hashing...

2007-02-20

2007-02-20

Vu, Kim (Department: 2135)

Cryptography

Particular algorithmic function encoding

C713S168000

Reexamination Certificate

active

10323168

ABSTRACT:
Generating a message digest includes selecting a first hashing procedure or a second hashing procedure for a message having words. If the first hashing procedure is selected, a first function is applied to a first subset of words at a function module to yield a first function output, and a second subset of words and the first function output are combined at an adder to yield a first sum. Next words are generated in accordance with the first sum. If the second hashing procedure is selected, a second function is applied to a third subset of words at the function module to yield a second function output, and a fourth subset of words and the second function output are combined at the adder to yield a second sum. Next words are generated in accordance with the second sum.

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R. Rivest,The MD5 Message-Digest Algorithm; Network Working Group, MIT Laboratory for Computer Science and RSA Data Security, Inc., pp. 1-21, Apr. 1992.
Secure Hash Standard, Federal Infromation Processing Standards Publication 180-1; Supersedes FIPS PUB 180, May 11, 1993, pp. 1-18, Apr. 17, 1995.

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