Also something I found out yesterday which is embarassing because apparently its been in since FO3 is when you're hacking a Terminal you'll see a bunch of garbage characters. You can highlight over some (generally enclosed with braces, tags, brackets) and if you click them it removes dud passwords. So if you have like <(!~`)> and if the entire thing is highlighted when you mouse over it will remove a dud (there is also one that will reset your attempts.)