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Level 17

Log in to the server with bandit17 and the key.

There are 2 files in the homedirectory: passwords.old and passwords.new. The password for the next level is in passwords.new and is the only line that has been changed between passwords.old and passwords.new.

This is easy. I can just use the diff utility to give me a list of differences between the two files.

bandit17@bandit:~$ diff passwords.{old,new}
42c42
< hlbSBPAWJmL6WFDb06gpTx1pPButblOA
---
> kfBf3eYk5BPBRzwjqutbbfE887SVc5Yd
bandit17@bandit:~$

The key in the last line is the password.