OverTheWire: Bandit Level 11
This is going to be a walkthrough of Level 11 of Bandit from OverTheWire Wargames.
We found the password from level 10.
Username: bandit11
Password: IFukwKGsFW8MOq3IRFqrxE1hxTNEbUPR
The information tells us we need to rotate the text in data.txt by 13 positions. Commonly known as a rot13 cipher.
So let’s open up a shell using SSH and cat data.txt.
This is another level which can be cleared by googling rot13 cipher and pasting in the line of text. This is also a tricky thing to do in bash as there is no function that can magically rotate letters.
There is a function though that can translate letters call tr. Our purpose of using this command is to translate our line of text by 13 places, half the alphabet.
To do this is a bit tricky and requires you know a little bit of regular expressions.
(This here is a good little exercise which introduces gently regular expressions https://regexone.com/)
First we need to list all the current characters in use with a-zA-Z.
And to rotate by 13, we need to then specify an out of order alphabet by 13 characters. n-za-mN-ZA-M
Given in command form:
Which gives the password to the next level.
To continue, please read my Bandit 12 walkthrough. Level 12
Thank you for reading. 