US Patent No: 4,424,414

Number of patents in Portfolio can not be more than 2000

Exponentiation cryptographic apparatus and method

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Abstract

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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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Patent Owner(s)

Patent OwnerAddressTotal Patents
THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIVERSITYPALO ALTO, CA2022

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hellman, Martin E Stanford, CA 12 2584
Pohlig, Stephen C Acton, MA 1 327

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Patent Info (Count) # Cites Year
 
WISTARIA TRADING, INC. (43)
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7,568,100 Steganographic method and device 53 1997
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7,987,371 Optimization methods for the insertion, protection, and detection of digital watermarks in digital data 0 2008
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7,953,981 Optimization methods for the insertion, protection, and detection of digital watermarks in digital data 3 2009
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6,959,381 Central key authority (CKA) database for user accounts in ABDS system 24 2003
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KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS (12)
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HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. (8)
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Other [Check patent profile for assignment information] (21)
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* Cited By Examiner