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cryptonomicon by neal stephenson

Cryptonomicon by Neal Stephenson is a popular work of fiction that masterfully combines elements of war, code-breaking, and technology. 

Synopsis

The novel operates across two main time periods: World War II and the late 1990s. 

WWII Storyline: Mathematical genius Lawrence Pritchard Waterhouse and Marine Raider Bobby Shaftoe are part of a top-secret Allied unit (Detachment 2702) working to break the Nazis' Enigma code while simultaneously using elaborate deception to prevent the Germans from realizing their codes are compromised.

Present-Day Storyline: Randy Waterhouse (Lawrence's grandson) is a crypto-hacker attempting to establish a data haven in Southeast Asia, a place where digital information can be stored free from government scrutiny. He teams up with Amy Shaftoe (Bobby's granddaughter) to salvage a sunken Nazi submarine that holds clues to a massive, decades-old conspiracy involving an unbreakable Nazi code and hidden gold.