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File compression defeats virus scanners.

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No matter how quickly the speed of Internet connections increases, we still find it convenient to compress files before we send them. Once a file is compressed, however, it becomes harder for a virus scanner to find any virus that may be lurking within. The challenge -- peering inside the various compression and archival formats to discover the viruses hidden within -- has become more difficult over time. This article will discuss the implications of utilizing various forms of file compression on virus protection.

To properly understand files that can contain viruses, we need to distinguish between archive files and compressed files, particularly compressed executable files.
 
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