how does antivirus works? [closed]

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. 开发者_Go百科 Closed 11 years ago.

What are the basic working principles of an antivirus program?

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it matches patterns of known viruses with each file.

for example change the executable into a histogram and compare the similarity between that executable and known viruses.

another way is to scan for design patterns such as polymorphisism and comparing those to, this can lead to false positives (in very complex apps) but also catch unknown viruses.

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A antivirus reads trough all files and searches for patterns of known viruses in the files.