×

Method for the management of an application program loaded in a microcircuit medium

  • US 5,191,608 A
  • Filed: 09/11/1991
  • Issued: 03/02/1993
  • Est. Priority Date: 09/12/1990
  • Status: Expired due to Term
First Claim
Patent Images

1. A method for the management of an application program in a microcircuit-based medium, comprising the following steps:

  • preparing a first encrypted signature as a function of a secret code of the microcircuit and predetermined instructions of the program;

    loading said signature into a programmable memory of the microcircuit;

    loading said program into a program memory of the microcircuit;

    preparing a second encrypted signature in the microprocessor of the microcircuit during the execution of said application program;

    comparing the first signature to the second signature; and

    allowing said program to run if the first signature equals the second signature.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×