Exponentiation cryptographic apparatus and method

Details Exponentiation cryptographic apparatus and method Exponentiation cryptographic apparatus and method

1978-05-01

1984-01-03

Cangialosi, Sal

Telegraphy

Systems

Printing

178 221, 178 2214, H04K 900

Patent

active

044244142

ABSTRACT:
A cryptographic system transmits a computationally secure cryptogram that is generated from a secret transformation of the message sent by the authorized transmitter; the cryptogram is again transformed by the authorized receiver using a secret reciprocal transformation to reproduce the message sent. The secret transformations use secret cipher keys that are known only by the authorized transmitter and receiver. The transformations are performed with nonsecret operations, exponentiation, that are easily performed but extremely difficult to invert. It is computationally infeasible for an eavesdropper either to solve known plaintext-ciphertext pairs for the secret cipher keys, or to invert the nonsecret operations that are used to generate the cryptogram.

REFERENCES:
patent: 4079188 (1978-03-01), Kinch, Jr. et al.
"New Directions in Cryptography", Hellman et al., IEEE Transactions on Information Theory, vol. IT-22, No. 6, Nov. 76, pp. 644-654.
"Multiuser Cryptographic Techniques", Diffie et al., AFIPS-Conference Proceedings, vol. 45, pp. 109-112, Jun. 1976.

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