Enhanced ANSI X9.17 and FIPS 186 pseudorandom number...

Details Enhanced ANSI X9.17 and FIPS 186 pseudorandom number... Enhanced ANSI X9.17 and FIPS 186 pseudorandom number...

2006-03-08

2010-10-05

Vu, Kimyen (Department: 2435)

Cryptography

Key management

Having particular key generator

C708S250000, C708S254000

Reexamination Certificate

active

07809136

ABSTRACT:
Disclosed herein are apparatuses and methods for generating pseudorandom numbers by making the existing ANSI and FIPS PRNGs forward secure and eliminating the need for re-keying them. A forward secure ANSI PRNG is created which includes an enhanced block cipher that is non-invertible even if the key becomes known and a function of the block cipher used in the existing ANSI PRNG. Additionally, the forward secure ANSI PRNG includes an enhanced next state that allows previous states to remain secret even when the key and the current state become known. A forward secure FIPS PRNG is created which includes a computation of an enhanced next state that is noninvertible.

REFERENCES:
patent: 7007050 (2006-02-01), Saarinen
P. Gatmann, “Software Generation of Practically Strong Random Numbers, In Proceeding of the 7thUNENIX Security Symposium” San Antonio, Texas, Jan. 26-29, 1998.
J. Kelsey, et al. “Cryptanalytic Attacks on Pseudorandom Number Generators, Fast Software Encryption, Fifth International Workshop, LNCS, vol. 1372” Paris, France, Mar. 1998.

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