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

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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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIVERSITYPALO ALTO, CA2786

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hellman, Martin E Stanford, CA 11 2334
Pohlig, Stephen C Acton, MA 1 310

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Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
WISTARIA TRADING, INC. (42)
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5,687,236 Steganographic method and device 442 1996
7,568,100 Steganographic method and device 41 1997
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7,095,874 Optimization methods for the insertion, protection, and detection of digital watermarks in digitized data 41 2003
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7,761,712 Steganographic method and device 31 2005
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7,457,962 Optimization methods for the insertion, protection, and detection of digital watermarks in digitized data 37 2006
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8,225,099 Linear predictive coding implementation of digital watermarks 0 2010
8,467,525 Steganographic method and device 0 2010
8,307,213 Method and system for digital watermarking 0 2010
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8,121,343 Optimization methods for the insertion, protection, and detection of digital watermarks in digitized data 0 2010
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Other [Check patent profile for assignment information] (21)
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