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Preboot protection of unauthorized use of programs and data with a card reader interface

  • US 5,515,440 A
  • Filed: 04/21/1994
  • Issued: 05/07/1996
  • Est. Priority Date: 06/04/1992
  • Status: Expired due to Fees
First Claim
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1. A method for controlling access to a computer having a central processing unit (CPU), the CPU executing a boot program to initialize the computer, the method comprising the steps of:

  • following power-up clear or reset of the CPU,interrupting execution of the boot program; and

    loading a verification program from a nonvolatile dedicated memory;

    upon attempted access by a user,executing the verification program to determine whether the user is authorized to access the computer;

    if the user is authorized, completing execution of the boot program and providing access to the computer; and

    if the user is not authorized, denying the user access to the computer.

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