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Are there any tutorials available for learning how to do encryption of an EXE ? I am particular interested on how it decrypt's itself and runs in memory.

If there are any tutorials or post that explain the basics of this please refer me them.

Thanks.

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Check out packing and unpacking techniques, find and reverse some known ones to see how they work. Apart from encryption techniques, you can also check other anti-reversing techniques like the good-old code obsfucation, junk bytes and how malwares analyze your runtime environment, your registry (if in windows) and your running threads to see if they are being debugged.

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