Method and apparatus for increasing the speed of the detecting of computer viruses
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United States of America Patent
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Dec 5, 1995
Issued Date -
N/A
app pub date -
Aug 31, 1992
filing date -
Mar 30, 1992
priority date (Note) -
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Abstract
A method and apparatus for increasing the speed at which a computer can scan files for computer viruses examines the initial state information of each file and stores this state information in a cache. Since viruses generally add themselves to preexisting files, they generally change the lengths or other characteristics of the files. During a scan, current state information is gathered regarding the length and/or other characteristics of the current state of the file and this information is compared to the length and characteristics from the initial state of the file. If the initial state information is different than the current state information then the files are scanned for certain subsets of viruses which affect files in a manner which is determined by the differences in such initial and current state information.
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