WahlwortJohn Jackson: Solving Enigma's Secrets – The Official History of Bletchley Park's Hut 6. BookTower Publishing 2014, p 211. (nonsense word or filler)OKM: Der Schlüssel M – Verfahren M Allgemein. Berlin 1940, p 10.OKM: Nachrichtenvorschrift der Kriegsmarine – Anlage 19. Berlin 1943, p 26. is a cryptographic term used particularly in connection with the Wehrmacht, which used wahlworts on their Enigma rotor machine in the encryption of their communication in World War II. The term describes a randomly selected word which was inserted at the beginning or end of the radiogram plaintext. The wahlwort was intended to hinder the enemy's cryptanalysis and prevent the decryption of the ciphertext.
