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Computer-implemented method and system for embedding ancillary information into the header of a digitally signed executable

  • US 8,397,072 B2
  • Filed: 03/31/2006
  • Issued: 03/12/2013
  • Est. Priority Date: 05/20/2005
  • Status: Active Grant
First Claim
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1. A method comprising:

  • identifying, by use of a processor, an existing digital signature block and an existing digital signature size block in a digitally signed file header;

    modifying a digital signature size value in the digital signature size block, the modified value corresponding to the size of the digital signature block plus the length of an ancillary data block plus a pre-determined pad;

    appending the ancillary data block to the end of the digital signature block, the modifying and appending being performed without invalidating an existing digital signature of the digitally signed file header; and

    storing ancillary data in the ancillary data block.

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