1
$\begingroup$

Can some one please express M209 Cipher Machine in terms of LFSR with Diagram or any simple method?

$\endgroup$
  • $\begingroup$ There is no LFSR in Hagelin. $\endgroup$ – kelalaka Jul 11 at 19:57
  • $\begingroup$ i want it with M209 not Hagelin $\endgroup$ – SK Niazi Jul 12 at 11:56
  • 2
    $\begingroup$ Well, AFAIK, it is also known as M209-Hagelin due to designer. Anyway, the rotors of M209 are not LFSR. I have got a chance to operate this device. If you want to see how it can be breakable, there were articles in Cryptologia... $\endgroup$ – kelalaka Jul 12 at 18:35
1
$\begingroup$

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.

internal

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

$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.