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Nebula level14 write-up

In Level14 we are given an encrypted token: 857:g67?5ABBo:BtDA?tIvLDKL{MQPSRQWW. and the cipher. We can try to reverse the cipher but lets play with it and see if we can find out the encryption routine: [email protected]:/home/flag14$ ./flag14 -e aaaaaaaaaaaaaaaaa abcdefghijklmnopq [email protected]:/home/flag14$ ./flag14 -e abcdefg acegikm Ok, so it looks pretty simple, we shift a given characters a number of positions in the ASCII table where the key is the position of the character to encrypt.