Anti-spoof without error extension (ANSWER)

Details Anti-spoof without error extension (ANSWER) Anti-spoof without error extension (ANSWER)

1995-10-12

1998-03-31

Cangialosi, Salvatore

Cryptography

Key management

Having particular key generator

H04L 900

Patent

active

057347212

ABSTRACT:
There is disclosed encryption apparatus for generating a deterministic psuedorandom keystream of data derived from a secret key and a prearranged initial state and modulo-N adding the random data to plain text data to form a cipher text data stream to be transmitted. In order to reduce spoofing, which is the ability to alter received plain text by altering the transmitted cipher text there is means responsive to the plain text for altering a portion of the plain text data relative to corresponding cipher text data according to a permutation function which varies according to a selected keystream whereby one who does not possess said secret key cannot decrypt said cipher text and while preventing spoofing.

REFERENCES:
patent: 4658094 (1987-04-01), Clark
patent: 4685132 (1987-08-01), Bishop et al.
patent: 4809295 (1989-02-01), Zscheile, Jr. et al.
patent: 5048086 (1991-09-01), Bianco et al.
patent: 5438622 (1995-08-01), Normile et al.
Contemporary Cryptology, Gustavos J. Simmons, IEEE Press, 1992 (title page only).

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