Method and apparatus for providing cryptographic protection of a

Details Method and apparatus for providing cryptographic protection of a Method and apparatus for providing cryptographic protection of a

1993-08-26

1994-06-07

Cangialosi, Salvatore

Cryptography

Key management

Having particular key generator

380 49, H04L 928

Patent

active

053197127

ABSTRACT:
A method and apparatus for providing cryptographic protection of a data stream are described in accordance with the Open Systems Interconnection (OSI) model for a communication system. This cryptographic protection is accomplished on the transmitting side by assigning a packet sequence number to a packet derived from a data stream received from a network layer. Subsequently, a transmit overflow sequence number is updated as a function of the packet sequence number. Then, prior to communicating the packet and the packet sequence number on a physical layer, the packet is encrypted as a function of the packet sequence number and the transmit overflow sequence number. On the receiving side, the packet sequence number is extracted from the physical layer. In addition, a receive overflow sequence number is updated as a function of the packet sequence number. Finally, the encrypted packet is decrypted as a function of the packet sequence number and the receive overflow sequence number. In addition, a transmitting and a receiving communication unit for use in a communication system which includes cryptographic protection of a data stream is described.

REFERENCES:
patent: 4866772 (1989-09-01), Schroyer
patent: 5099517 (1992-02-01), Gupta et al.
patent: 5161193 (1992-11-01), Lampson et al.
patent: 5235595 (1993-08-01), O'Dowd
patent: 5235644 (1993-08-01), Gupta et al.
"The Basics Book of OSI and Network Management" by Motorola Codex from Addison-Wesley Publishing Company, Inc., 1993 (First Printing Sep. 1992).
"Description of Receiver State Feedback Protocol" proposed by AT & T Bell Laboratories, 1000 East Warrenville Road, Naperville, Ill. 60566 which was presented to the Telecommunications Industry Association (TIA) subcommittee TR45.3.2.5 for Digital Cellular Systems in the Data Services Task Group on Jul. 7, 1993 at the Woodmark Hotel in Kirkland.
"Proposed RLP Header Formats" proposed by AT & T Bell Laboratories, 1000 East Warrenville Road, Naperville, Ill. 60566-7013 which was presented to the Telecommunications Industry Association (TIA) subcommittee TR45.3.2.5 for Digital Cellular Systems in the Data Services Task Group on Jul. 7, 1993 at the Woodmark Hotel in Kirkland.

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