Electronic intelligence Cryptography 7 World War, 1939-1945 6 Military intelligence 4 United States 3 Communication systems 2 Confidential communications 2 Naval operations, American 2 Allied Forces 1 Campaigns 1 Cold War 1 Computer crimes 1 Coral Sea, Battle of the, 1942 1 Cryptologic technicians 1 Cyber intelligence (Computer security) 1 Eavesdropping 1 Foreign relations 1 History 1 Holocaust, Jewish (1939-1945) 1 Internet 1 Internet in espionage 1 Midway, Battle of, 1942 1 Pearl Harbor (Hawaii), Attack on, 1941 1 Secret service 1 Security measures 1 Sissons, D. C. S. 1 World War (1939-1945) 1