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Antivirus technology is essentially based on blacklisting technology, where known "baddies" are listed. The problems with this are pretty obvious : one generally has to list every known instance of malware and there are literally thousands created every day (heuristics help but generate too many False positives), and in view of the rapidly increasing numbers of malware, recently interest as shifted towards a strategy/technology known as whitelisting. Whitelisting turns blacklisting on its head, instead of listing all the bad guys, it lists all the good guys in a "whitelist", and denies all others. |