rtmoran.org — Cybersecurity and Linux Resource

Over the Wire’s Bandit Challenge – Level 11


Level 11 – bandit – overthewire

Level Instructions:

“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.”

bandit11@bandit:~$ ls -la
total 24
drwxr-xr-x  2 root     root     4096 Dec 28  2017 .
drwxr-xr-x 42 root     root     4096 Jul 22 18:42 ..
-rw-r--r--  1 root     root      220 Sep  1  2015 .bash_logout
-rw-r--r--  1 root     root     3771 Sep  1  2015 .bashrc
-rw-r--r--  1 root     root      655 Jun 24  2016 .profile
-rw-r-----  1 bandit12 bandit11   49 Dec 28  2017 data.txt
bandit11@bandit:~$ cat data.txt
Gur cnffjbeq vf 5Gr8L4qetPEsPk8htqjhRK8XSP6x2RHh
bandit11@bandit:~$ cat data.txt | tr [:alpha:] 'N-ZA-Mn-za-m'
The password is 5Te8Y4drgCRfCx8ugdwuEX8KFC6k2EUu

The password in level 11 has been encrypted by ROT13, a process that advances each letter character by 13.  By piping the contents of the file into the tr (translate) command we can first specify the types of characters we would like to translate (all alphanumerical; A-Za-z) and secondly order how we would like those characters transposed (A-Za-z –>> N-ZA-Mn-za-m).

Leave a Reply

Your email address will not be published. Required fields are marked *