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Multiple Signatures for File Integrity Check Disclosure Number: IPCOM000040000D
Original Publication Date: 1987-Sep-01
Included in the Prior Art Database: 2005-Feb-01

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Related People

Nyfeler, JA Williamson, DW [+details]


A method is described for verifying the integrity of a file. It is often necessary to verify the integrity of a file. Some files use a single coded (signature) area at the front of the file to verify that the file is secure. Although this is an efficient way to quickly verify if a file is secure, the accuracy of this method is questionable. If an error is imbedded in a file, the error does not usually affect the signature at the front. A better solution is to imbed the signatures at strategic points in the file. The more random the location of the signatures, the better the likelihood that the signature will be affected if an error situation is encountered. By randomly distributing the signatures throughout the file and checking the signatures for errors, the likelihood that an error will be detected is significant.