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Method for effective tamper resistance

  • US 7,996,685 B2
  • Filed: 06/06/2008
  • Issued: 08/09/2011
  • Est. Priority Date: 12/19/2006
  • Status: Active Grant
First Claim
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1. A method for preventing offline tampering of a software program, implemented by a computer, comprising:

  • evolving a unique initial key value assigned to a copy of the software program when the copy of the software program executes using an integrity check and a one-way function that produces a new key value within a chosen mathematical subgroup, such that the new key value will stay within the subgroup unless tampering to the copy of the software program occurs; and

    regulating behavior of the copy of the software program using the new key value, such that the integrity check fails if the evolved new key value is incorrect and the copy of the software program will not function correctly.

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