Bandit [Level 11] - Overthewire

ssh bandit11@bandit.labs.overthewire.org -p 2220
bandit password: 6zPeziLdR2RKNdNYFNb6nVCKzphlXHBM

Task

The password for the next level is stored in the file data.txt, where all lowercase (a-z) and uppercase (A-Z) letters have been rotated by 13 positions.

Solution

The data.txt file contains 1 line that was encrypted with the ROT13 algorithm

bandit11@bandit:~$ cat data.txt
Gur cnffjbeq vf WIAOOSFzMjXXBC0KoSKBbJ8puQm5lIEi

Replace every letter by the letter 13 positions ahead

cat data.txt | tr '[A-Za-z]' '[N-ZA-Mn-za-m]'

Look Result: The password is JVNBBFSmZwKKOP0XbFXOoW8chDz5yVRv

==> CTF: { JVNBBFSmZwKKOP0XbFXOoW8chDz5yVRv }