A company I used to work for was partly comprised of hackers, and one of the books they always raved about was called Cryptonomicon. I know that it involves the nazis and encoded secrets, though I never read it (still on my to-read list). I'd recommend checking it out if that kind of thing sounds interesting to you.
I read it back in the day. I can't remember much of the plot, but i do remember that it seemed about twice as long as it needed to be. Which I find ro be typical of Stephenson's fiction. Plenty of people seem to like it though.
He does like regressions into historical causes and effect chains... hell the whole system of the world trilogy is almost nothing BUT that (and contains some character/family crossovers with cryptonomicon)
