History20th century (1995 release; content from 1940s)United States/Soviet Unionhigh confidence

The first public release of translated VENONA messages occurred in July 1995 and contained 49 messages concerning Soviet attempts to obtain information about U.S. atomic-bomb research and the Manhattan Project.

Notes on verification

Corroborated by independent CIA, NSA/Cryptologic Foundation, and Library of Congress sources, all consistent on date, message count, and subject matter. [tier=gold indep_score=1.0 clusters=4 claim_tier=notable]

Sources