Title: The emperor's codes
Subjects: Electronic intelligence, Machine ciphers, ULTRA (Intelligence system), World War, 1939-1945, Cryptography, Secret service, British Personal narratives, Great Britain, Great Britain. Government Code and Cypher School, History, World War (1939-1945) fast (OCoLC)fst01180924, Great Britain. Government Communications Headquarters, World war, 1939-1945, cryptography, World war, 1939-1945, secret service, great britain, World war, 1939-1945, japan
Places: United States, Japan, Great Britain