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== Polymorphic encryption ==
Polymorphic code can be also used to generate encryption algorithm. This code was generated by the online service StringEncrypt.<ref name="stringencrypt">[https://www.stringencrypt.com Wójcik, Bartosz (2015). ''String & File Encryption'']</ref> It takes the string or a file content and encrypts it with random encryption commands and generates polymorphic decryption code in one of the many supported programming languages:
<
// encrypted with https://www.stringencrypt.com (v1.1.0) [C/C++]
// szLabel = "Wikipedia"
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wprintf(szLabel);
</syntaxhighlight>
As you can see in this C++ example, the string was encrypted and each character was stored in encrypted form using [[UNICODE]] widechar format. Different encryption commands were used like bitwise [[XOR]], [[Bitwise NOT|NOT]], addition, subtraction, bit rotations. Everything is randomized, encryption keys, bit rotation counters and encryption commands order as well. Output code can be generated in [[C/C++]], [[C Sharp (programming language)|C#]], [[Java (programming language)|Java]], [[JavaScript]], [[Python (programming language)|Python]], [[Ruby (programming language)|Ruby]], [[Haskell (programming language)|Haskell]], [[MASM]], [[FASM]] and [[AutoIt]]. Thanks to the randomization the generated algorithm is different every time. It's not possible to write generic decryption tools and the compiled code with polymorphic encryption code has to be analyzed each time it's re-encrypted.
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