Writeup for InCTF 2014 - Crypto 100 - XOR decipher

There are three files, one.txt, one.txt.enc and second.txt.enc. Challenge is to decrypt the second.txt.enc using the key. So we got a message + cipher, so we got a hint that operation done using XOR. So XORing (Message ^ Cipher) = Key.



The output is
 The XOR cipher is a very weak choice for a cipher and should not in practice. The flag for this level is the decryption key itself.
Flag is {xorkey}