US Patent No: 5,375,169

Number of patents in Portfolio can not be more than 2000

Cryptographic key management method and apparatus

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Abstract

A system for the secure communication of a message from a transmitting user to a receiving user using a split key scheme. Each user generates a key component using a cryptographic engine. The key component is a pseudorandom sequence of bits with an appended error detection field which is mathematically calculated based on the pseudorandom sequence. This key component is then sent out on a communications channel from the transmitting user to the receiving user. The receiving user also sends its key component to the transmitting user. Each location performs a mathematical check on the key component received from the other location. If the key component checks pass at both locations, the transmit key component and the receive key component, including the error detection fields, are combined at both locations, forming identical complete keys at both locations. The identical complete keys are then used to initiate the cryptographic engines at both locations for subsequent encryption and decryption of messages between the two locations.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
CROWLEY, JOHN J.VIENNA, VA1

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Crowley, John J Rockville, MD 6 244
Seheidt, Edward M McLean, VA 2 168

Cited Art

Patent Info (Count) # Cites Year
 
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Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
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7,577,838 Hybrid systems for securing digital assets 4 2002
7,930,756 Multi-level cryptographic transformations for securing digital assets 5 2003
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7,703,140 Method and system for securing digital assets using process-driven security policies 17 2003
7,707,427 Multi-level file digests 16 2004
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8,327,138 Method and system for securing digital assets using process-driven security policies 0 2010
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NOKIA CORPORATION (3)
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CONTENTGUARD HOLDINGS, INC. (1)
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GILBARCO INC. (1)
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