by Kahn, David
306
“had, on the basis”: MA: III M 1006/4:147.
306
telling the Japanese ambassador: NA:RG 457: Diplomatic “Magic” Summaries: 24 September 1943:2.
306
basic cryptosecurity principle: MA: III M 1006/4:147.
308
Naval Cypher No. 5: Hinsley, 2:636–38.
308
“The two main”: MA: III M 1006/6:169.
309
Adressbuch: Hinsley, 2:552, 681–82.
309
less than half avoided: Hinsley, 2:555.
22. The U-Tankers
Information on the attacks on the U-66 and U-117 comes from U.S. Navy, Naval Historical Center, Operational Archives, World War II Action Report, Commander in Chief, U.S. Atlantic Fleet, Hunter-Killer Operations, Serial 001020, Report Nos. 1–43 and 2–43, Task Group 21.14. Other details come from SRGN; SRMN-033; PG 30063; BdU, KTB; the deck log of the U.S.S. Card; and Lundeberg.
311
“milch cows”: Werner Rahn, “Weiträumige deutsche U-Boot-Operationen 1942/43 und ihre logistische Unterstützung durch U-Tanker,” unpublished paper.
312
adamant refusal: Hinsley, 3:1:212–13.
312
“we should not risk”: Hinsley, 2:549.
313
“if our Z information”: Hinsley, 2:549.
313
U-118: Y’Blood, 55–59.
23. The Reckoning
Calculations of the value of codebreaking are from SRH 368 and Rohwer, “Einfluss,” 359–61.
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