Method and apparatus for identifying the existence of differences between two files
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United States of America Patent
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Jul 17, 2001
Grant Date -
N/A
app pub date -
Jul 1, 1998
filing date -
Jul 1, 1998
priority date (Note) -
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Abstract
A method and apparatus identifies the existence of differences between two files on a personal computer, such as two versions of a Windows registry file. Some or all of each of the files are hashed into a four byte value per file, and each hash is combined with a four byte size of the portion of the file from which the hash was generated to produce a fingerprint of each file. If the two files are different versions of a Windows registry file, the portion of the file hashed are the values of the Windows registry file. If the two files are different, there is a high probability that the fingerprints of the two files will be different. The fingerprints may be compared to provide a strong indicator whether the two files are different.
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