Telegraphy – Systems – Printing
Patent
1977-10-06
1980-08-19
Birmiel, Howard A.
Telegraphy
Systems
Printing
364900, H04L 904
Patent
active
042185823
ABSTRACT:
A cryptographic system transmits a computationally secure cryptogram that is generated from a publicly known transformation of the message sent by the transmitter; the cryptogram is again transformed by the authorized receiver using a secret reciprocal transformation to reproduce the message sent. The authorized receiver's transformation is known only by the authorized receiver and is used to generate the transmitter's transformation that is made publicly known. The publicly known transformation uses operations that are easily performed but extremely difficult to invert. It is infeasible for an unauthorized receiver to invert the publicly known transformation or duplicate the authorized receiver's secret transformation to obtain the message sent.
REFERENCES:
"New Directions in Cryptography," Diffie et al., IEEE Transactions on Information Theory, vol. II22, No. 6, Nov. 1976, pp. 644-654.
"A User Authentication Scheme not Requiring Secrecy in the Computer," Evans, Jr., et al., Communications of the ACM, Aug. 1974, vol. 17, No. 8, pp. 437-442.
"A High Security Log-In Procedure," Purdy, Communications of the ACM, Aug. 1974, vol. 17, No. 8, pp. 442-445.
Diffie et al., "Multi-User Cryptographic Techniques," AFIPS Conference Proceedings, vol. 45, pp. 109-112, Jun. 8, 1976.
Hellman Martin E.
Merkle Ralph C.
Birmiel Howard A.
The Board of Trustees of the Leland Stanford Junior University
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