The enigma machine had a serious flaw: the letters could not be encrypted as themselves. Is there an online enigma simulator I can try that does not have this flaw, which would likely make it secure?
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I think you're looking for the Typex machine.
It was developed by the British and it had the major design flaw of the Enigma machine removed, which was the fixed-point-free permutation, meaning that no letter will be encrypted to itself.
A Typex simulator can be downloaded on Github (released by GCHQ). Unfortunately I could not find an online simulator, but maybe you'll have more luck.
answered Feb 25, 2020 at 13:34
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1$\begingroup$ It also had more irregular stepping, which made it better. $\endgroup$ Feb 25, 2020 at 13:53