OP-20-G

#	Item
11	SECRET pproved for Release by NSA on[removed]FOIA Case # [removed]Robert L. Benson Add to Reading List Source URL: www.nsa.gov Language: English - Date: 2011-03-08 08:48:56 Signals intelligence Cyberwarfare Intelligence Attack on Pearl Harbor OP-20-G William F. Friedman Federal Bureau of Investigation National Security Agency Central Intelligence Agency National security Security Military communications
12	OOClO: [removed]toJ[removed]P . L . Add to Reading List Source URL: www.nsa.gov Language: English - Date: 2011-07-08 11:13:49 Military communications Signals intelligence Attack on Pearl Harbor Intelligence analysts Military intelligence Traffic analysis OP-20-G Laurance Safford National Security Agency National security Espionage Cryptography
13	DOCID: [removed] Add to Reading List Source URL: www.nsa.gov Language: English - Date: 2011-07-08 11:13:26 Attack on Pearl Harbor Rotor machines Intelligence analysts Herbert Yardley Code Purple Enigma machine Room 40 OP-20-G Cryptography Espionage Japan–United States relations
14	DOCID: [removed]Cryptologic Almanac 50 th Anniversary Series Add to Reading List Source URL: www.nsa.gov Language: English - Date: 2010-09-23 10:31:00 Attack on Pearl Harbor Cyberwarfare National Security Agency Mass surveillance United States government secrecy Agnes Meyer Driscoll Purple Laurance Safford OP-20-G Cryptography United States Department of Defense Intelligence analysts