Love the movie, but the entire premise is flawed almost from moment 1

So, we all know that the computer system David wanted to hack into was a Pentagon system. Forgetting the fact that those systems, even back in the early 80s, were highly encrypted, the idea that the US DoD would essentially ignore a handful of unauthorized access attempts by David (when he's trying random logon names like "000001," "Falkens-maze," etc.) is LAUGHABLY unbelievable. His incorrect guesses would have immediately been red-flagged by the Pentagon's IT security personnel, and the FBI would have been knocking down David's door before he even figured out that "Joshua" was his backdoor into the system. Hell, even his IP address would have surprised the system, as there's no way it would have authorized access from someone without a known IP address to login.

Like I said, I loved the movie when I was a kid, but there's no way David would have gotten the chance to enter as many bad logon credentials as he did without setting off alarm bells at the Pentagon within minutes or hours at most. Especially considering that this movie took place during the height of the Cold War. He would have been in jail within hours to a few days after even just a couple of incorrect guesses. That's just my two cents on the matter. :-P