Cryptonomicon (1999) is a science fiction novel by Neal Stephenson. Describing events in two different time periods—World War II and an unspecified period in the 1990s—the novel tells the interconnected stories of a large cast of characters. One timeline follows Lawrence Pritchard Waterhouse, a mathematician and naval captain who is assigned to a 1942 secret, anti-Nazi cryptographic mission, and the other follows his grandson, Randy, a crypto-hacker uncovering a decades-old conspiracy in the present day. The novel explores Secrecy, Surveillance, and Power Across Eras; Mathematics and Cryptography as Both Art and Weapon; and The Intergenerational Legacies of War and Trauma.

This guide uses the 2000 HarperCollins paperback edition.

Content Warning: The source material and guide feature depictions of substance dependency, sexual content, sexual violence, anti-gay bias, death by suicide, wartime violence and genocide, and racism. The novel features frequent use of offensive racial language and racial slurs.

Plot Summary

The novel begins in Shanghai, China, where Corporal Bobby Shaftoe is part of a detail that fetches stacks of paper out of a military building and then burns the paper. The men working in another section of the installation are code-breakers who have been deciphering messages sent by the Nazis using their Enigma Machine, which they do not realize the Allies have cracked.

In 1942, Lawrence Pritchard Waterhouse, a mathematical genius attending Princeton, meets mathematicians Alan Turing and Rudolf von Hacklheber. They share their groundbreaking ideas about math and cryptology. Turing soon returns to England. He writes to Waterhouse, but it is clear from the stilted style of his letter that he is prevented from saying anything about what he is actually doing due to government secrecy. Waterhouse attempts to do his patriotic duty by joining the Navy, but his unimpressive physical condition and lack of coordination land him first in the band at the Pearl Harbor base. After the base is attacked, Waterhouse shows his talent as a mathematician and is reassigned to the cryptography school. His mathematical skills soon make him one of the leading code-breakers and he contributes to the compendium of code-breaking procedures the Navy has created, known casually as the Cryptonomicon.

In an unspecified time in the 1990s. Randy Waterhouse, Lawrence’s grandson, and his business partner, Avi, are meeting in Manila to discuss a new business venture. They communicate electronically using encrypted messages. The two have had several business failures in the past; Randy ruminates on the amount of money he lost in a complicated legal issue involving their first business venture, which sprang from their shared love of role-playing board games. The encryption Avi insists on is much more powerful than necessary, but Avi believes that computing power will eventually break most encryption systems. He is paranoid about government interference.

They found the Epiphyte Corporation and set up an office in the Intramuros. They hire Semper Marine, a company owned by Douglas MacArthur Shaftoe (Bobby’s son) and Douglas’s daughter, America (also known as Amy), to lay underwater cable that will connect the Philippines to the wider Internet. Randy is very attracted to Amy. He begins to think about her romantically as he tries to unravel the complications of his most recent long-term relationship with an academic named Charlene.

Back in World War II, Bobby Shaftoe meets Glory, a Filipino girl, and is smitten. He also meets a Japanese soldier, Goto Dengo, and they become friendly, with Goto Dengo teaching Bobby haiku and martial arts. Bobby believes that he will marry Glory; they have sex on the night that Manila is attacked by the Imperial Japanese army. Bobby, involved in the battle of Guadalcanal, has PTSD; Enoch Root rescues him from the battle’s aftermath, though the traumatic memories—particularly those involving a big lizard—stay with him for the rest of his life. Bobby also develops a morphine dependency.

Eventually, Bobby is reassigned to Detachment 2702. Detachment 2702 engages in missions that Bobby finds puzzling. He slowly pieces together that the strange operations of Detachment 2702 are designed to confuse the enemy about Allied plans. Lawrence Waterhouse is part of the leadership of Detachment 2702; when Alan Turing and his team in England broke the Enigma encryption, Waterhouse and Turing realized that if the Allies used every piece of intelligence gleaned accurately, the Germans would soon realize that their codes had been compromised. Detachment 2702 is part of a scheme to obscure the fact that the Allies can read every single message the Nazis send. Bobby and his fellow Marines launch daring and absurd missions to concoct plausible explanations for the Allies’ knowledge of German movements. Bobby once again meets Enoch Root in Detachment 2702. He is the chaplain, who helps Bobby deal with his morphine dependency and overall confusion.

Goto Dengo is assigned as an engineer to build a huge bunker in the mountains in the Philippines. He is mystified as to the purpose of the installation, but his experience of mining under the tutelage of his father gives him the expertise needed to construct a vast underground facility. He realizes that the Japanese are hiding vast quantities of stolen gold and treasure to be used in a postwar world. He also realizes that this facility, which he nicknames “Golgotha,” will be so secret that he and the other workers will all be killed upon completion. He plots with the forced laborers to produce a means of escape, all while building the facility.

In the 1990s, Amy Shaftoe points out treasure still sitting on the ocean floor after it was dumped during World War II. Her father, Douglas, suggests to Randy that any treasure found while laying the cable should be split between them, on the condition that they do not tell a famous businessman, Dr. Hubert Kepler, known as “the Dentist.” The Dentist is an investor in Epiphyte and Randy fears that the Dentist will try to take over the company by any means necessary. Secretly, he tells Douglas to recover the gold bars found on a mysterious sunken German U-boat.

Randy and Avi meet with potential business partners, revealing that Epiphyte will be a data haven based in the Sultanate of Kinakuta, a secure digital fortress outside of any government’s control, which will enable them to protect the privacy of their customers’ communications. They also plan to create a digital currency backed by the gold that they recover from the submarine. Randy begins to suspect some of his partners cannot be trusted, while also becoming interested in his grandfather’s unbroken codes from World War II.

In World War II, Lawrence has been assigned to a remote island off the coast of Scotland, where he pretends to send messages about U-boats as part of Detachment 2702’s work. After, he is sent to Brisbane, where he starts a relationship with a young woman whom he will eventually marry. As well as breaking enemy codes, Lawrence begins to work on a proto computer. In his conversations with Turing, he suspects that their old friend, Rudolf von Hacklheber, has worked on the German codes. He speculates that Rudy may be leaving them hints, since he hates the Nazis. After being stranded in Sweden, Bobby Shaftoe makes his way back to the Philippines to save Glory with the help of General Douglas MacArthur. He learns that he has a son, but also that Glory has leprosy. During the American invasion of Manila, Bobby saves his son but dies in a heroic attack on a Japanese base.

In the 1990s, the surviving Goto Dengo is contacted by Avi and Randy. Through his father’s codes, Randy has learned the location of Golgotha. They hope to use the recovered gold to back a digital currency as a means of supporting the Asian countries destroyed by Japan during the war. They track down the hidden horde of gold, and, in the final scenes of the novel, Randy organizes for the gold to be melted down and recovered from the facility.