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After encryption systems were "broken", there was a large volume of cryptologic work needed to recover daily key settings and keep up with changes in enemy security procedures, plus the more mundane work of processing, translating, indexing, analyzing and distributing tens of thousands of intercepted messages daily. [86]
The reflector ensured that Enigma would be self-reciprocal; thus, with two identically configured machines, a message could be encrypted on one and decrypted on the other, without the need for a bulky mechanism to switch between encryption and decryption modes. The reflector allowed a more compact design, but it also gave Enigma the property ...
Public-key encryption was first described in a secret document in 1973; [14] beforehand, all encryption schemes were symmetric-key (also called private-key). [15]: 478 Although published subsequently, the work of Diffie and Hellman was published in a journal with a large readership, and the value of the methodology was explicitly described. [16]
The Enigma encryption is a self-inverse function, meaning that it substitutes letters reciprocally: if A is transformed into R, then R is transformed into A. The plugboard transformation maintained the self-inverse quality, but the plugboard wiring, unlike the rotor positions, does not change during the encryption.
In April 1937 [33] Knox made his first decryption of an Enigma encryption using a technique that he called buttoning up to discover the rotor wirings [34] and another that he called rodding to solve messages. [35] This relied heavily on cribs and on a crossword-solver's expertise in Italian, as it yielded a limited number of spaced-out letters ...
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The size of the key space of the Enigma-M4 can be calculated from the four individual partial keys and the number of different key settings possible in each case. [11] The total key space of the Enigma-M4 results from the following four factors: a) die Walzenlage Three out of eight reels are selected for the right three places. [12]
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