[Cryptography] Imitation Game: Can Enigma/Tunney be Fixed?

ArW a at arw.me
Tue Jan 6 16:23:11 EST 2015

>>> Enigma would need to be modified so all letters have equal probabilities.
>>> Someone who knows the intricacies of these rotor machines better than me
>>> might know what's involved.
>> The Enigma actually had two fatal weaknesses.  First, as you
>> correctly point out, the allies exploited the can't-map-to-
>> itself property to great effect; t was how the Bombes
>> eliminated possibilities in great quantities once they were
>> started.
> My impression was that the steckerboard did not significantly help against cryptanalysis (contrary to what the Germans thought). The closures (or cycles) that were used to drive the bombes were independent of the steckering.

There's a great article of the first Enigma cryptanalysis by the Polish cryptographer himself:


bit of a bad scan, but well worth a read.


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