Goal: Find the password and log into level 11. The password is in data.txt file which contains base64 encoded data.
Since we know that the text is base 64 encoded we can simply pipe the data to the base64 command and use the -d flag to specify we are decoding (otherwise it will try to encode the data).
bandit10@bandit:~$ cat data.txt | base64 -d
The password is [REDACTED]Now we have our password for level 11 and we sign into the next level!