Re:Cryptanalysis of Enigma
by xg15 on Tuesday November 01, 2016 @06:25PM
(#12850645)
I was surprised about this bit:
It is interesting to note that the actual key settings used the indicator 'SIG' with ring settings 'PMP', but the [different] recovered key gives an identical decryption.
So there are keys of the enigma that produce the same ciphertext? Wouldn't that reduce the practical keyspace dramatically?
Also, would that mean a message could be "hardened" by referring to the original key within it? (E.g. "Execute order <second letter of indicator><first letter of indicator>)
It is interesting to note that the actual key settings used the indicator 'SIG' with ring settings 'PMP', but the [different] recovered key gives an identical decryption.
So there are keys of the enigma that produce the same ciphertext? Wouldn't that reduce the practical keyspace dramatically?
Also, would that mean a message could be "hardened" by referring to the original key within it? (E.g. "Execute order <second letter of indicator><first letter of indicator>)