So, I've consumed 3,000+ pages of Mr. Stephenson this year [I read 'Quicksilver' in early 2014 otherwise add another K], and there is no doubt the man spin a tale.
While I (and most others) call the Baroque Cycle ['Quicksilver', 'The Confusion' and 'The System of the World'] historical novels, 'Cryptonomicon' is not. It is just a novel.
Published 16 years ago in 1999 it does not feel dated in the least. We are still facing several of the same issues today with regard to security and privacy. That is the underlying theme as the book bounces back and forth between WWII and the present.
This book does contain some math concepts, but none are very long or complex and do not slow the story down [DISCLAIMER: I am not the right person to be objective about the mathematics :)] but it does introduce the concepts of information theory and cryptography which should be important to everyone in our world today.
If you enjoy world-hopping techno-thrillers with quite a bit of levity, this is for you.