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Modern malware has become a major threat to today's Internet communications. The threat can infiltrate hosts using a variety of methods, such as attacks against known software vulnerabilities, hidden functionality in regular programs, drive-by download from unsafe web sites, and so forth. Matching a file stream against a known virus pattern is a fundamental technique for detecting viruses. With the popularity and variety of malware attack over the Internet, computer virus protection companies need to constantly update new virus signatures in their virus definition databases. However, the increasing size of the signature database can only detect known virus but cannot defend against new variants of malware.
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