Cryptographic apparatus and method

Details Cryptographic apparatus and method Cryptographic apparatus and method

1977-09-06

1980-04-29

Birmiel, Howard A.

Telegraphy

Systems

Printing

340149R, 375 2, 455 26, H04L 904

Patent

active

042007704

ABSTRACT:
A cryptographic system transmits a computationally secure cryptogram over an insecure communication channel without prearrangement of a cipher key. A secure cipher key is generated by the conversers from transformations of exchanged transformed signals. The conversers each possess a secret signal and exchange an initial transformation of the secret signal with the other converser. The received transformation of the other converser's secret signal is again transformed with the receiving converser's secret signal to generate a secure cipher key. The transformations use non-secret operations that are easily performed but extremely difficult to invert. It is infeasible for an eavesdropper to invert the initial transformation to obtain either conversers' secret signal, or duplicate the latter transformation to obtain the secure cipher key.

REFERENCES:
"New Directions in Cryptography", Diffie et al., IEEE Transactions on Information Theory, vol. IT-22, No. 6, Nov. 1976.
Diffie & Hellman, Multi-User Cryptographic Techniques", AFIPS Conference Proceedings, vol. 45, pp. 109-112, Jun. 8, 1976.

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