TheCodeBreakers
Nihilist cipher 344, 368 Nimitz, C. W., 303, 304, 310,
311, 312, 334, 335, 337 97-shiki O-bun In-ji-ki, 21, 46
See also PURPLE N.K.V.D., 360, 368 Noise (in information
theory), 450^51 Nomenclators, xiv, 84, 87, 402, 427
death of, 112, 114 Nomura, T., 325 North Africa campaign, 239,
251-256 Norway, 242, 257-258, 259,
264 N.S.A. See National Security
Agency
Nsibidi script, 77 Null, definition, xii Null cipher, 281, 282-283,
293
Oberkommando der Kriegs-marine, 231, 241, 264
Oberkommando der Luftwaffe, 231, 240
Oberkommando der Wehr-
macht, 231-237 Oberkommando des Heeres,
231, 237 Occultism, 79 Oda, Lieutenant, 326 Office of Strategic Services,
273
Off-line encipherment, definition, 197
O.G.P.U., 361, 362 Ohnesorge, W., 296-298 Oite. See PA-K2 O.K.H. 231, 237 O.K.L. 231, 240 O.K.M. 231,
241, 264 O.K.W. 321-237 On-line encipherment, 197,
400 138th Radio Intelligence
Company 320-322 One-time pad, 216, 368, 371-