Exponentiation cryptographic apparatus and method
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United States of America Patent
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-
Jan 3, 1984
Grant Date -
N/A
app pub date -
May 1, 1978
filing date -
May 1, 1978
priority date (Note) -
Expired
status (Latency Note)
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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.
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