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.

 8JUN_UNRECOVERED.PDFCompletely unrecovered message 8 June 1943 (Release 2)
 6JUN_ANTON.PDFCompletely unrecovered. References ANTON 6 June 1943 (Release 2)
 31JAN_COMRADE_CHIKIN.PDFComrade ChIKIN 31 January (Release 5)
 31MAR_BEHAVIOR.PDFConcerns about behavior of Soviet official
 2APR_FAMILY.PDFConcerns about family members back in USSR 2 April 1943 (Release 4)
 9FEB_CONTACTING_KGB_AGENTS.PDFConditions for contacting KGB agents
 1AUG_REISSUE_CLAUDE.PDFConditions on confederation less favorable for legal activity by "FRATERNALS"; "TECHNICIAN" to consult "CLAUDE" and submit proposals for organizing work with him; CLAUDE'S opportunities for stepping up his work and for arranging trips to the island
 6DEC_PETELIN.PDFConfirmation of PETELIN's access to secret correspondence 6 December 1943 (Release 5)
 29AUG_RECEIPT_CIPHER_PADS.PDFConfirmation of receipt of cipher pads 29 August (Release 5)
 15JUN_SHIP_MOVEMENTS.PDFConflicting reports about ship movements 15 June 1943 (Release 4)
 15DEC_CONTACT_CLAUDE.PDFContact with "CLAUDE" 15 December (Release 5)
 12JUN_TELEGRAM_497.PDFContinuation of telegram 497 12 June 1943 (Release 2)
 1SEP_CONVERSATION_EVATT_LIFANOV.PDFConversation between EVATT and LIFANOV about MALONEY 1 September (Release 5)
 4NOV_VETROV_SIDORENKO.PDFConversation by VETROV with SIDORENKO regarding the use of coercion 4 November 1942 (Release 5)
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