Cryptographic apparatus and method

Details Cryptographic apparatus and method Cryptographic apparatus and method

H - Electricity

04

K

340/70

H04K 1/00 (2006.01)

Patent

CA 1121480

CRYPTOGRAPHIC APPARATUS AND METHOD Abstract of the Disclosure 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 con- versers' secret signal, or duplicate the latter transforma- tion to obtain the secure cipher key.

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