About the book: 2019 / The book tells the story of the birth and development of ciphers and codes, cryptology and special types of classified communications in the USA, American cryptological services, encryption techniques and classification equipment ; military special communications networks; describes the espionage activities of American intelligence agencies in the “hunt” for Soviet ciphers, successes and failures in this area, as well as the emergence of asymmetric cryptology and its practical use today.