Exponentiation cryptographic apparatus and method

Details Exponentiation cryptographic apparatus and method Exponentiation cryptographic apparatus and method

H - Electricity

04

L

340/70

H04L 9/00 (2006.01)

Patent

CA 1152592

EXPONENTIATION CRYPTOGRAPHIC APPARATUS AND METHOD ABSTRACT OF THE DISCLOSURE 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 trans- formations are performed with nonsecret operations, exponen- tiation, 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.

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