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Have you ever encountered any DRM using M/o/Vfuscator (compiler that only produces mov instructions) or REpsych (psychological warfare against reverse engineers)? The DEF CON talk about REpsych is pretty hilarious and worth watching.

https://github.com/xoreaxeaxeax/movfuscator https://github.com/xoreaxeaxeax/REpsych

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You may be interested in the demovfuscator - https://github.com/kirschju/demovfuscator

Unfortunately I have encountered neither in the real world, although I have defeated both in CTFs before.

The defeats sound interesting, have you documented those anywhere?

I haven't personally, but you will find multiple writeups googling for "movfuscator ctf writeup" etc.

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