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Avoiding server storage of client state

  • US 7,493,331 B2
  • Filed: 03/21/2007
  • Issued: 02/17/2009
  • Est. Priority Date: 01/12/2004
  • Status: Expired due to Fees
First Claim
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1. An apparatus, comprising:

  • a network interface that is coupled to a data network for receiving or transmitting one or more packet flows;

    a processor coupled to the network interface;

    one or more stored sequences of instructions which, when executed by the processor, cause the processor to perform;

    based on a local key that is not known to a first client, encrypting first client state information to produce first encrypted information, wherein the first client state information includes authorization information;

    receiving, at a first time, from the first client, both the first encrypted information and a first request;

    based on the local key, decrypting the first encrypted information that was received from the first client, thereby producing first decrypted information;

    determining, based on authorization information that was included in the first decrypted information, whether the first request is authorized; and

    satisfying the first request only if the first request is authorized;

    wherein the apparatus is a first computer and wherein the first client is implemented by a second computer and is communicatively coupled with the first computer.

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