The Venona project was a long time secret plan which started in February 1943 by the United States Army Signal Intelligence Service. The project was transferred to the National Security Agency and had many names. However, VENONA was the last name that was used. The word VENONA is usually in capital letters (VENONA) but some writings use lowercase letters (Venona). VENONA was made to decrypt secret communications of Soviet intelligence agencies including NKVD, KGB and GRU. Decryption was possible because the encrypting one-time pads were reused.