A cryptology related novel by Neil Stephenson.
ISBN 0380973464
"For several years I have been working on a series of novels on the general subject of cryptology. Since cryptology is mathematics, which most people do not consider interesting reading, I have broadened my scope a little bit to include related fields such as Money (e.g. digital currency), War (e.g. the Enigma), and Power (e.g. crypto export controls) which can provide the basis for a more engaging yarn."