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Authenticity of communications traffic

  • US 7,483,423 B2
  • Filed: 03/30/2005
  • Issued: 01/27/2009
  • Est. Priority Date: 03/30/2005
  • Status: Expired due to Fees
First Claim
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1. A method capable of storing information in a packet, comprising:

  • performing a data integrity operation over one selectable portion of the packet to calculate an integrity check value using a secret key, wherein the one selectable portion of the packet includes a Virtual Local Area Network (VLAN) field, an Internet Protocol (IP) field, and a Transmission Control Protocol (TCP)/User Datagram Protocol (UDP) field; and

    performing a data transformation operation over another selectable portion of the packet to store the integrity check value in the other portion of the packet, without increasing a size of the packet, wherein the another selectable portion of the packet is a data field;

    wherein the data transformation operation comprises a reversible operation.

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