The U.S. Army's Signal Intelligence Service, the precursor to the National Security Agency, began a secret program in February 1943 later codenamed VENONA

The mission of this small program was to examine and exploit Soviet diplomatic communications but after the program began, the message traffic included espionage efforts as well.

Although it took almost two years before American cryptologists were able to break the KGB encryption, the information gained through these transactions provided U.S. leadership insight into Soviet intentions and treasonous activities of government employees until the program was canceled in 1980.

The VENONA files are most famous for exposing Julius (code named LIBERAL) and Ethel Rosenberg and help give indisputable evidence of their involvement with the Soviet spy ring.

The first of six public releases of translated VENONA messages was made in July 1995 and included 49 messages about the Soviets' efforts to gain information on the U.S. atomic bomb research and the Manhattan Project. Over the course of five more releases, all of the approximately 3,000 VENONA translations were made public.

 11MAR_DESERTER.PDFThe deserter Elizabeth Kuznetsova
 30APR_PRIVATE.PDFThe departure of covername PRIVATE
 KARAS.PDFThe Covername "KARAS" in Traffic
 27SEP_CONVOY.PDFThe convoy service 27 September 1943 (Release 4)
 16MAR_CONSUL-GENERAL.PDFThe Consul-General is being transferred from San Francisco to Washington. He thinks it a poor idea 16 March (Release 4)
 2MAR_CONSUL_GENERAL_CHAUFFEUR.PDFThe Consul General's chauffeur 2 March (Release 4)
 18JUL_REPEATS_MSG.PDFThe code clerk repeats a message 18 July 1943 (Release 4)
 20MAY_CIPHER_ROOM.PDFThe cipher room. Also, dicussion of Japanese actions. 20 May 1943 (Release 4)
 5JUN_CIPHER.PDFThe cipher room in Portland 5 June 1943 (Release 4)
 10AUG_REPEATS_MSG.PDFThe cipher clerk repeats part of a garbled message 10 August 1943 (Release 4)
 13MAR_SOVIET_PERSONALITY.PDFThe Center tells NY not to meet a Soviet personality 13 March (Release 3)
 29MAR_MEDICAL_JOURNALS.PDFThe center requests medical journals 29 March (Release 3)
 6APR_ILLEGAL_ALBERT.PDFThe Center instructs NY KGB to use Illegal ALBERT to keep in touch with Harry Dexter White 6 April (Release 3)
 8APR_ESPIONAGE_MATERIAL.PDFThe Center gives instructions photography of espionage material 8 April (Release 3)
 1APR_KGB_NY.PDFThe Center evaluates material from KGB NY sent by courier 1 April (Release 3)
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