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Description:
I created my own cipher and encrypted the very important file.
However, I lost the decryption program because of file system error, so now I cannot read the file.
Please help me.

Writeup: 
http://van.prooyen.com/reversing/cryptography/2016/12/11/Lost-Decryption-Writeup.html

Downloads:
Challenge: 
https://github.com/docileninja/docileninja.github.io/raw/master/files/lost_decryption.zip
Solution: https://github.com/docileninja/docileninja.github.io/blob/master/files/lost.c