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Which of these viruses would completely recode itself after an infection without use of encryption?
Multipartite
Metamorphic
Boot sector
Megamorphic
Polymorphic
Metamorphic viruses recode themselves at the core, polymorphic viruses rely on encryption and other obfuscation techniques: http://searchsecurity.techtarget.com/definition/metamorphic-and-polymorphic-malware
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