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Compression virus
A compression virus is an example of a benevolent computer virus, invented by Fred Cohen. It searches for an uninfected executable file, compresses the file and prepends itself to it. The virus can be described in pseudo code〔(1984, Computer Viruses - Theory and Experiments )〕
program compression-virus:=
}
The ''01234567'' is the virus signature, and is used to make sure (''if first-line-of-file = 01234567'') the file is not already infected. The virus then asks for permission (''ask-permission'') to infect a random executable (''get-random-executable-file''). If the permission is granted, it compresses the executable (''infect-executable''), prepends itself to it (''prepend''), uncompresses the current executable file (''uncompress the-rest-of-this-file'') into a temporary file(''tmpfile'') and runs it (''run tmpfile'').
''Cruncher'' is an example of a compression virus,〔Mark A. Ludwig 1995, ''Giant Black Book of Computer Viruses'' p.10〕 a strain of which - ''Cruncher.2092''〔(McAfee article on Cruncher.2092, ''read Characteristics'' )〕 is described by McAfee as memory-resident virus that infects all but small com files, making them smaller. The reason for excluding small programs is that their infected versions will be bigger than their originals.
== References ==
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抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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