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Secure delegation using public key authentication

  • US 7,698,736 B2
  • Filed: 08/05/2008
  • Issued: 04/13/2010
  • Est. Priority Date: 08/03/2001
  • Status: Expired due to Fees
First Claim
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1. A method of authenticating a client, comprising:

  • receiving a pre-nonce token and a common nonce that has been signed by a client at a back-end server of a plurality of back-end servers from a middle tier server that is impersonating the client, wherein;

    the pre-nonce token comprises a combination of pre-nonce contributions from the plurality of back-end servers;

    the common nonce is created by hashing the pre-nonce token and is generated from an entity other than the client that the middle tier server is impersonating or the plurality of back-end servers that the middle tier server is to interact with on behalf of the client;

    authenticating the client based on the received signed common nonce;

    hashing the pre-nonce token using the same hashing technique used to create the common nonce from the pre-nonce token; and

    verifying the middle tier server based upon a comparison of the received common nonce and hashed value of the received pre-nonce token.

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