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Hash functions are useful in which of these virus detection schemes?
All of these
Signature based
Anomaly based
Change based
A hash would be generated for all legitimate files. When infected, their hash would change. This would be detected using a change based scheme. EDIT: Antivirus though, would take examine the file and index it based off of a hash of the file. If the file later turned up on another system, wouldn't the hash be used as a signature?
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