Cryptonomicon

"The problem is that when your whole relationship with the fellow is built around cryptology, you can't even really poke your head in the door without violating that order."

"Yes, it is most awkward."

"I guess he's doing okay." Waterhouse does not say this very convincingly and there is an appropriate silence around the table.

"When he was in better spirits, he wrote glowingly of your work on the Cryptonomicon,"says one of the Other Guys, who has not spoken very much until now. Waterhouse pegs him as some kind of unspecified mover and shaker in the world of machine cryptology.

"He's a heck of a fella," Waterhouse says.

The Main Guy uses this as an opening. "Because of your work with Dr. Schoen's Indigo machine, you are, by definition, on the Magic list. Now that this country and yours have agreed--at least in principle--to cooperate in the field of cryptanalysis, this automatically puts you on the Ultra list."

"I understand, sir," Waterhouse says.

"Ultra and Magic are more symmetrical than not. In each case, a belligerent Power has developed a machine cypher which it considers to be perfectly unbreakable. In each case, an allied Power has in fact broken that cypher. In America, Dr. Schoen and his team broke Indigo and devised the Magic machine. Here, it was Dr. Knox's team that broke Enigma and devised the Bombe. The leading light here seems to have been Dr. Turing. The leading light with you chaps was Dr. Schoen, who is, as you said, under the weather. But he holds you up as comparable to Turing, Commander Waterhouse."

"That's pretty darn generous," Waterhouse says.

"But you studied with Turing at Princeton, did you not?"

"We were there at the same time, if that's what you mean. We rode bikes. His work was a lot more advanced."

"But Turing was pursuing graduate studies. You were merely an undergraduate."

"Sure. But even allowing for that, he's way smarter than me."

"You are too modest, Captain Waterhouse. How many undergraduates have published papers in international journals?"

"We just rode bikes," Waterhouse insists. "Einstein wouldn't give me the time of day."

"Dr. Turing has shown himself to be rather handy with information theory," says a prematurely haggard guy with long limp grey hair, whom Waterhouse now pegs as some sort of Oxbridge don. "You must have discussed this with him.

The don turns to the others and says, donnishly, "Information Theory would inform a mechanical calculator in much the same way as, say, fluid dynamics would inform the hull of a ship." Then he turns back to Waterhouse and says, somewhat less formally: "Dr. Turing has continued to develop his work on the subject since he vanished, from your point of view, into the realm of the Classified. Of particular interest has been the subject of just how much information can be extracted from seemingly random data."

Suddenly all of the other people in the room are exchanging those amused looks again. "I gather from your reaction," says the Main Guy, "that this has been of continuing interest to you as well."

Waterhouse wonders what his reaction was. Did he grow fangs? Drool into his coffee?

"That's good," says the Main Guy before Waterhouse can answer, "because it is of the highest interest to us as well. You see, now that we are making efforts--and I must emphasize the preliminary and unsatisfactory level of these efforts to this point--to coordinate intelligence between America and Britain, we find ourselves in the oddest situation that has ever faced a pair of allies in a war. We know everything, Commander Waterhouse. We receive Hitler's personal communications to his theater commanders, frequently before the commanders do! This knowledge is obviously a powerful tool. But just as obviously, it cannot help us win the war unless we allow it to change our actions. That is, if, through Ultra, we become aware of a convoy sailing from Taranto to supply Rommel in North Africa, the knowledge does us no good unless we go out and sink that convoy."

"Clearly," Waterhouse says.

"Now, if ten convoys are sent out and all of them are sunk, even those under cover of clouds and darkness, the Germans will ask themselves how we knew where those convoys could be found. They will realize that we have penetrated the Enigma cypher, and change it, and then this tool will be lost to us. It is safe to say that Mr. Churchill will be displeased by such an outcome." The Main Guy looks at all of the others, who nod knowingly. Waterhouse gets the feeling that Mr. Churchill has been bearing down rather hard on this particular point.