Cryptographic apparatus with double feedforward hash function

Details Cryptographic apparatus with double feedforward hash function Cryptographic apparatus with double feedforward hash function

1995-07-03

1997-02-25

Buczinski, Stephen C.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 25, 380 49, 380 42, H04L 900, H04L 906

Patent

active

056066163

ABSTRACT:
Apparatus is provided for authenticating information using a double feedforward hash function to provide complementarity in the implementation of an encryption algorithm. A cryptographic processor has a first input for receiving plaintext, a second input for receiving a key and an output for outputting ciphertext generated by cryptographically processing the plaintext and key. A first circuit element is responsive to the ciphertext and plaintext for outputting a first ciphertext derivative. A second circuit element is responsive to at least a portion of the first ciphertext derivative and the key for outputting a second ciphertext derivative. The first and second circuit elements can be XOR gates. Alternatively, these elements can be provided using lookup tables. Subsequent cryptographic processor stages can be provided having a first input for receiving second plaintext, a second input for receiving the second ciphertext derivative as a key, and an output for outputting second ciphertext generated by cryptographically processing the second plaintext and the second ciphertext derivative. In an illustrated embodiment, the cryptographic processor is a DES processor.

REFERENCES:
patent: 5005200 (1991-04-01), Fischer
patent: 5307409 (1994-04-01), Driscoll
patent: 5432848 (1995-07-01), Butter et al.
patent: 5544244 (1996-08-01), Ogura
Bruce Schneier, "Applied Cryptography: Protocols, Algorithms, and Source Code in C," .COPYRGT.1994 John Wiley & Sons, Inc., pp. 339-341 and 447-448 .

Affiliated with

Also associated with

Rating

Cryptographic apparatus with double feedforward hash function does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Cryptographic apparatus with double feedforward hash function, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cryptographic apparatus with double feedforward hash function will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1979739