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.

 7JAN_CORRECTION_HUSBAND.PDFCorrection to: "HUSBAND" to discover agenda of Scandinavian premiers' conference
 28JAN_MGB_BOGOTA.PDFCorrection to: MGB Bogota for neglecting work on Soviet colony
 15APR_MILITARY_INFO_CORRECTION.PDFCorrection to: Military Information; and Query about buying a car and reference to the NEW COMRADE 15 April 1942 (Release 5)
 30MAY_CORRECTION_EFIM.PDFCorrection to: Moscow criticizes "EFIM" for lax observation of security rules
 24JUN_PERSON_REQUESTS_PYMT.PDFCorrection to: Person requests payment 24 June (Release 5)
 21OCT_TECHNICIAN_CLAUDE_CORRECTION.PDFCorrection to: Precautionary measures to be observed in work involving TECHNICIAN and CLAUDE 21 October (Release 5)
 8NOV_CORRECTION_D_IN_LONDON.PDFCorrection to: Reference to possible agent "D" and an arrival in London
 4APR_REPORT_YANEK.PDFCorrection to: Report from YaNEK 4 April 1942 (Release 5)
 29APR_CORRECTION_WORKSHOPS.PDFCorrection to: Report of Army workshops, AA guns and petrol stocks in Oslo area
 26JUN_BALTIC_REFUGEES_CORRECTION.PDFCorrection: Agents at work among Baltic refugees 26 June (Release 5)
 19APR_CORRECTION_ANDRE.PDFCorrection: Inquiry about . . . and ANDRE 19 April 1943 (Release 5)
 1JUN_CORRECTION_TO_SERIAL_NUMBER.PDFCorrection: Please alter the external serial number in the message heading to read 169, instead of 237 1 June (Release 5)
 14APR_COURIER.PDFCourier activities 14 April 1943 (Release 4)
 11MAR_COURIER.PDFCourier matters 11 March 1943 (Release 4)
 24MAR_COURIER.PDFCourier matters 24 March 1943 (Release 4)
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