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Remote device authentication system

  • US 6,799,272 B1
  • Filed: 05/26/1999
  • Issued: 09/28/2004
  • Est. Priority Date: 05/26/1999
  • Status: Expired due to Fees
First Claim
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1. A method of authenticating a remote device, the method comprising the steps of:

  • (a) transmitting identification Information from the remote device to an authentication center of a service provider, wherein the remote device and the authentication center of said service provider each contain an identical key code index, the key code index including a plurality of key code numbers;

    (b) generating a first key at the authentication center using at least a portion of the identification information and a first random number, wherein the first random number specifies a first key code number that is one of the plurality of key code numbers;

    (c) transmitting the first key from the authentication center to the remote device;

    (d) determining the first key code number at the remote device using the first key;

    (e) generating a second key at the remote device using the first key code number and a second random number, wherein the second random number specifies a second key code number;

    (f) transmitting the second key to the authentication center;

    (g) determining the second key code number at the authentication center using the second key;

    (h) comparing, at the authentication center, the first key code number and the second key code number; and

    (i) authenticating the remote device when the first and second key code numbers in the comparing step match.

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