In this level the password is stored in the file data.txt in one of the only human readable strings, beginning with several = characters.
Although this file has the extension .txt, it is binary data. To extract the password we will use the command strings. This goes through a binary file and outputs all printable characters in the file. As most of these are just sequences of symbols, we need to narrow down the search somewhat. We therefore grep for ==.
strings data.txt | grep "=="
Once the command runs we get the output:
This reveals the password: G7w8LIi6J3kTb8A7j9LgrywtEUlyyp6s