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Authentication system based on periodic challenge/response protocol

  • US 6,088,450 A
  • Filed: 04/17/1996
  • Issued: 07/11/2000
  • Est. Priority Date: 04/17/1996
  • Status: Expired due to Term
First Claim
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1. A method to control an operating state of a node, the method comprising:

  • authenticating a token by a user inputting data into the token;

    authenticating a node by exchanging messages between the token possesed by the user and the node, periodically performing the message exchange to ascertain whether the token is within a predetermined distance from the node, and disabling at least one peripheral device of the node in order to place the node into a non-operational state if the token is determined to be outside a range established by the predetermined distance; and

    periodically authenticating the token by requiring the user to input the data into the token.

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