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Method for identifying the validity of an executable file description by appending the checksum and the version ID of the file to an end thereof

  • US 5,991,774 A
  • Filed: 12/22/1997
  • Issued: 11/23/1999
  • Est. Priority Date: 12/22/1997
  • Status: Expired due to Fees
First Claim
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1. A method for checking integrity of a file used in the execution of an application program, the application program for use by a central processing unit (CPU) having an operating system, the method comprising:

  • A. computing a checksum record for the file before installing said file in the application program;

    B. generating a sealing string for the file, the sealing string including the checksum record of said file and any optional records;

    C. appending the sealing string to an end of said file;

    D. generating a listing of all applicable files pertinant to the operation of said application program, said listing including the sealing string of the file, said listing accessible by said CPU;

    E. installing said appended file in the application program;

    F. processing said installed file to decode its appended sealing string; and

    verifying a binary integrity of said file;

    G. preventing operation of said application program if said binary integrity fails.

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