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Method and apparatus for providing cryptographic protection of a data stream in a communication system

DC CAFC
  • US 5,319,712 A
  • Filed: 08/26/1993
  • Issued: 06/07/1994
  • Est. Priority Date: 08/26/1993
  • Status: Expired due to Term
First Claim
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1. In a communication system having a physical layer, data link layer, and a network layer, a method for providing cryptographic protection of a data stream, comprising:

  • (a) assigning a packet sequence number to a packet derived from a data stream received from the network layer;

    (b) updating a transmit overflow sequence number as a function of the packet sequence number;

    (c) encrypting, prior to communicating the packet and the packet sequence number on the physical layer, the packet as a function of the packet sequence number and the transmit overflow sequence number;

    (d) extracting the packet sequence number from the physical layer;

    (e) updating a receive overflow sequence number as a function of the packet sequence number; and

    (f) decrypting the encrypted packet as a function of the packet sequence number and the receive overflow sequence number.

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