[yodon]

+1 for the Cuckoo's Egg. It takes place a bit after the war-dialing era of Wargames and is factual rather than fiction but it's a great read and the real deal of network intrusions, hacking, and spies in the 80's (I met Cliff Stoll shortly after the main events of the book and we spent much of the next five years hanging out together after meeting in a phone networking distribution closet at the Harvard Smithsonian Center for Astrophysics, but that's a different story)