Cairncross smuggled out raw Tunny decrypts performed by Collosus. However Cairncross worked in translation not code breaking and did not have access to Enigma

Cairncross smuggled out raw Tunny decrypts performed by Collosus. However Cairncross worked in translation not code breaking and did not have access to Enigma decrypts He is unlikely to have comprehended nor been aware of the role of the method or the role or existence of the machine - due to the excellent op-sec secrecy separating huts. Anyone know of a good cold war history of encryption ?