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Computer file integrity verification

  • US 6,122,738 A
  • Filed: 01/22/1998
  • Issued: 09/19/2000
  • Est. Priority Date: 01/22/1998
  • Status: Expired due to Term
First Claim
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1. A method for verifying the integrity of contents within a computer file, said method comprising the steps of:

  • storing a security value S within the file, where S depends upon a verification function f, said file contents, and a preselected residual value r, where r is not stored within the file;

    applying f against the entire contents of the file including S, to obtain results R;

    comparing R against r; and

    when R equals r, determining that the file has not been modified.

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