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- Compression_virus abstract "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 codeprogram compression-virus:={01234567;subroutine infect-executable:= {loop:file = get-random-executable-file; if first-line-of-file = 01234567 then goto loop; compress file; prepend compression-virus to file; }main-program:= {if ask-permission then infect-executable; uncompress the-rest-of-this-file into tmpfile; run tmpfile;}}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, a strain of which - Cruncher.2092 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.".
- Compression_virus wikiPageExternalLink index.php?title=Compression_virus&action=edit&clicktrackingsession=xsSjZqx0DPYWnuQ0YYrKpfKmD6aA6h6Tw&clicktrackingevent=ext.articleFeedback%4010-pitch-edit-save.
- Compression_virus wikiPageID "23648708".
- Compression_virus wikiPageRevisionID "527546833".
- Compression_virus hasPhotoCollection Compression_virus.
- Compression_virus subject Category:Computer_viruses.
- Compression_virus type Abstraction100002137.
- Compression_virus type Code106355894.
- Compression_virus type CodingSystem106353757.
- Compression_virus type Communication100033020.
- Compression_virus type ComputerViruses.
- Compression_virus type MalevolentProgram106573020.
- Compression_virus type Program106568978.
- Compression_virus type Software106566077.
- Compression_virus type Virus106585816.
- Compression_virus type Writing106359877.
- Compression_virus type WrittenCommunication106349220.
- Compression_virus comment "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.".
- Compression_virus label "Compression virus".
- Compression_virus sameAs m.06zk1h2.
- Compression_virus sameAs Q5157055.
- Compression_virus sameAs Q5157055.
- Compression_virus sameAs Compression_virus.
- Compression_virus wasDerivedFrom Compression_virus?oldid=527546833.
- Compression_virus isPrimaryTopicOf Compression_virus.