There is a setuid `binary` in the homedirectory that does the following: it makes a connection to localhost on the port you specify as a commandline argument. It then reads a line of text from the connection and compares it to the password in the previous level `bandit20`. If the password is correct, it will transmit the password for the next level `bandit21`.

To gain access to the next level, you should use the `setuid` binary in the homedirectory. Execute it without arguments to find out how to use it. The password for this level can be found in the usual place `(/etc/bandit_pass)`, after you have used the setuid binary.

The password for the next level is stored in a file `readme` in the homedirectory. Unfortunately, someone has modified `.bashrc` to log you out when you log in with SSH.

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`

The credentials for the next level can be retrieved by submitting the password of the current level to a port on localhost in the range 31000 to 32000. First find out which of these ports have a server listening on them. Then find out which of those speak SSL and which don’t. There is only 1 server that will give the next credentials, the others will simply send back to you whatever you send to it.

The password for the next level can be retrieved by submitting the password of the current level to port 30001 on localhost using SSL encryption.

The password for the next level can be retrieved by submitting the password of the current level to port 30000 on localhost.

The password for the next level is stored in `/etc/bandit_pass/bandit14` and can only be read by user `bandit14`. For this level, you don’t get the next password, but you get a private SSH key that can be used to log into the next level. **Note:** `localhost` is a hostname that refers to the machine you are working on.

The password for the next level is stored in the file data.txt, which is a hexdump of a file that has been repeatedly compressed. For this level it may be useful to create a directory under /tmp in which you can work. Use mkdir with a hard to guess directory name. Or better, use the command “mktemp -d”. Then copy the datafile using cp, and rename it using mv (read the manpages!)

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.