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Encrypt image jpg, png ...

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We know gpg can be encrypt text file, but with image it can not because image (normally jpg or png) was not gpg supported format.

There are many other way to encrypt image, base idea is on bit or hex encrypt, modify ...

TODO: write simple C program to do this
http://stackoverflow.com/questions/26442162/decryption-of-png-and-jpg-files

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