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Identifying unauthorized communication systems using a system-specific identifier

  • US 7,325,065 B1
  • Filed: 01/30/2002
  • Issued: 01/29/2008
  • Est. Priority Date: 12/21/2001
  • Status: Expired due to Term
First Claim
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1. A method for determining whether a client communication system seeking access to a host communication system is authorized to do so, the method comprising:

  • receiving, at the host, from the client communication system, a user-independent client-communication-system-specific identifier and results of a first mathematical computation performed at the client on a first user-dependent access identifier and the user-independent client-communication-system-specific identifier;

    accessing, at the host and based on the receipt of the user-independent client communication-system-specific identifier, a second user dependent access identifier;

    performing a second mathematical computation using the accessed second user-dependent access identifier and the user-independent client-communication-system-specific identifier received from the client communication system;

    comparing results of the first and second mathematical computations; and

    designating a client communication system as unauthorized based on the comparison of the results of the first and second mathematical computations,wherein the user-independent client-communication-system-specific identifier is derived from information that identifies at least a hardware component or aspect of the client communication system.

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