About LFSR based M209 Cipher Machine Can some one please express M209 Cipher Machine in terms of LFSR with Diagram or any simple method?
The M-209 cipher machine cannot be expressed as an LFSR because it is not LFSR-based. It is its own construction, using six adjustable key wheels whose initial positions acted as the key for ciphering. Its operation is vaguely similar to a standard substitution cipher, but the substitution positions would change for each letter, making cryptanalysis more difficult. It had a period length of 101,405,850.



See also https://en.wikipedia.org/wiki/M-209