Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular communication authentication technique
Patent
1997-10-08
2000-06-20
Swann, Tod R.
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Particular communication authentication technique
713176, 713180, 380 46, H04L 920
Patent
active
060790180
ABSTRACT:
A document is digitally signed with a digital signature that is unique to the signer/document pair. A document digest is generated by applying a predefined one-way hash function to the document. A pseudo-random key is generated by combining the document digest with at least one other value in accordance with a predefined computational procedure. The digital signature is then generated as a predefined function of the private key, the document digest, and the pseudo-random key k. A distinct pseudo-random key is generated for each distinct specified document, and for a given value of the private key, a distinct digital signature is generated for each distinct specified document. In a preferred embodiment the pseudo-random key generating step includes combining the document digest with a value corresponding to the private key to generate an intermediate value, and hashing the intermediate value with the predefined one-way hash function to generate the pseudo-random key k. In another preferred embodiment the pseudo-random key generating step includes hashing the private key with the predefined one-way hash function to generate a first intermediate value, combining the document digest with a value corresponding to the first intermediate value and an ancillary secret value to generate a second intermediate value, and hashing the second intermediate value with the predefined one-way hash function to generate the pseudo-random key k.
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Horster et al., "Generalized ElGamal signatures for one message block", University of Technology Ghemnitz-Zwickau, Technical Report TR-94-3, May 1994, pp. 1-14.
"Digital Signature Standard (DDS)", Federal Information Processing Standards Publication 186, May 19, 1994, pp. 1-18.
B. Schneier, "Applied Cryptography, Protocols, Algorithms, and Source Code in C", Second Edition, Chapter 20, pp. 483-500, 1996.
Hardy Norman
Tribble E. Dean
Vetter Linda L.
Agorics, Inc.
Smithers Matthew
Swann Tod R.
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