Though "key" is the literal translation for Schlüssel, in this case Schlüssel M it should perhaps better be translated by Cipher M, meaning an algorithm for performing encryption or decryption, while a (cryptographic) key is just a parameter that determines the output of the algorithm. Best wishes --OS (talk) 08:18, 3 December 2018 (UTC)[reply]
Thank you. We have no idea of the technicalities. Do change this if you think it appropriate.--AnTransit (talk) 10:42, 19 December 2018 (UTC)[reply]
Done. --OS (talk) 08:13, 21 January 2019 (UTC)[reply]
