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Method for validating a signed program prior to execution time or an unsigned program at execution time

  • US 6,253,374 B1
  • Filed: 07/02/1998
  • Issued: 06/26/2001
  • Est. Priority Date: 07/02/1998
  • Status: Expired due to Term
First Claim
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1. A method for validating a program, comprising the steps of:

  • (a) determining whether a valid digital signature is associated with the program prior to loading the program, (b) if the valid digital signature is associated with the program, then setting a flag to indicate that the program is valid;

    (c) if the valid digital signature is not associated with the program, then determining whether the program is valid when the program is executed by checking input parameters to all instructions of the program; and

    (d) if the valid digital signature is associated with the program, then executing the program at run time without checking the input parameters to all instructions of the program.

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