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Method to authenticate a network access server to an authentication server

  • US 6,732,270 B1
  • Filed: 10/23/2000
  • Issued: 05/04/2004
  • Est. Priority Date: 10/23/2000
  • Status: Active Grant
First Claim
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1. A method of authentication between servers in a three party network authentication protocol, the method comprising the steps of:

  • providing at least one network access server (NAS) in communication with at least one user of the network and in communication with at least one remote authentication server (RAS) coupled to the network;

    sending an access request message including a user password from the at least one user to the NAS;

    creating an encrypted password at the NAS with a shared secret between the NAS and the RAS;

    attaching a message authentication code at the NAS to the encrypted password;

    sending the encrypted password and message authentication code to the RAS; and

    authenticating the NAS by verifying the message authentication code at the RAS before decrypting the encrypted user password.

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