Method and apparatus for verifying the integrity of a file stored separately from a computer
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United States of America Patent
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Sep 17, 1991
Grant Date -
N/A
app pub date -
Jun 20, 1990
filing date -
Jun 20, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for verifying a file stored separately from a computer to be identical with a previous version of the file, before using the file. This verification is done by following a defined procedure to generate a first identifier based on the contents of the previous version of the file, storing this identifier locally on the computer, and storing the file at a separate storage location. Then, at a later time, an unverified second file is retrieved from the separate storage location, the same defined procedure is followed to generate a second identifier, and the first and second identifiers compared to identify a match that verifies the integrity of the second file.
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