The password for the next level is stored in the file data.txt, which contains base64 encoded data
Commands you may need to solve this level: grep, sort, uniq, strings, base64, tr, tar, gzip, bzip2, xxd
If we do an ‘ls -la’ we see that there is an file data.txt in the home directory. Lets see what kind of file this is.
It has an ASCII text that is base64 encoded as the goal of the level says. Lets see the manpage of base64.
Looking at the manpage we can decode it using the -d option.
It prints: The password is IFukwKGsFW8MOq3IRFqrxE1hxTNEbUPR
This is the password for level 11.