Thanks so much for trying my game. There is a person who you do not need to solve the password for to complete the game. However, if you do get it, it will give a real revelation into their past. :)
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Sorry it took so long to get back to this. I just went through the code of the game to check on Dennis Whitham's password (it's been a while since I made the game), and you should be able to work that one out without too much trouble. The hints are definitely in there. It may just take a bit (lot) of trial and error. :) It wasn't Dennis that I was thinking about in my previous comment. It was someone else.