Digital Fortress

Digital Fortress is a novel written by Dan Brown, an Amarican writter and published in 1998, its a good book discussing about the world of encryption; decryption in National Security Agency (NSA), the bettel that NSA been through within the organization (between cryptographers, SYS-SECs, Internal security analyst
& the directors) etc. & outside the organization with the The Electronic Frontier Foundation (EFF).

The struggle between the cryptographers about the loyalty of and for NSA.

Worth reading.