They can detect accidental system and file corruption early, preventing additional damage as errors compound themselves. They can protect against viruses by looking at file and system behavior rather than static signatures. By their very nature, viruses cause integrity violations. Products such as Integrity Master from Stiller Research offer a dynamic means of virus protection unlike the classic signature-based mechanisms. Web sites are the most visible and vulnerable targets of integrity attacks - most of which are easily preventable.
Integrity checkers are well worth the investment.
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