The term is sometimes extended to several improved algorithms used much later for communication by the First Chief Directorate with its spies.
cipher | Lorenz cipher | Zero Cipher | Vigenère cipher | Cipher Bureau | Cipher | Caesar cipher | Alberti cipher | Wadsworth's cipher | substitution cipher | Skipjack (cipher) | Pigpen cipher | Nihilist Records | Nihilist movement | Great Cipher | Crab (cipher) | Cipher in the Snow | Camellia (cipher) | Book cipher | book cipher | Blowfish (cipher) | Bacon's cipher | ADFGVX cipher |