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Preboot protection for a data security system with anti-intrusion capability

  • US 5,610,981 A
  • Filed: 02/28/1995
  • Issued: 03/11/1997
  • Est. Priority Date: 06/04/1992
  • Status: Expired due to Fees
First Claim
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1. A method of operating a computer having a central processing unit, the central processing unit executing a boot program to initialize the computer, the method comprising the steps of:

  • a) prior to completion of the boot program, acquiring control of the central processing unit;

    b) loading a verification program;

    c) upon attempted access by a user, verifying that the user is authorized using the verification program; and

    d) controlling access to the computer by monitoring system calls.

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