Persistence, some general cryptography knowledge.
Your goal is decrypt Network Security Sam's password, which is conveniently provided. You also have access to the encryption script that he's using, though you cannot view it. There are couple of ways to do this mission and if you do not currently have any programming experience, this challenge is simple enough to do by hand. Play with the encryptor to get a feel for how it works. Take your time and you will figure this out.
*Additional hint: What is ASCII?*
Do not post spoilers!
"The quieter you become, the more you are able to hear..."
"Drink all the booze, hack all the things."