While the crib does not allow us to determine what the values after the plugboard are, it does provide a constraint between them.
42.
The Poles had used an early form of crib-based decryption in the days when only six leads were used on the plugboard.
43.
Current flowed from the battery ( 1 ) through a depressed bi-directional keyboard switch ( 2 ) to the plugboard ( 3 ).
44.
The interpreter took the two readings and translating then from two separate letters reading into one digraphic reading, which it sent to the plugboard.
45.
These permutations could be described by six equations with various unknowns, representing the wiring within the entry drum, rotors, reflector, and plugboard.
46.
The catalogue included every possible rotor position for " EINS " with that day's " wheel order " and plugboard connections.
47.
When a match is found, then the cryptanalyst would learn both the initial rotation of and the plugboard ( " Stecker " ) permutation.
48.
A user-friendly 3-rotor simulator, where users can select rotors, use the plugboard and define new settings for the rotors and reflectors is available.
49.
Now consider an old fashioned manual exchange ( you know-nice lady sitting at a big plugboard with a headset on, plugging wires in and out ).
50.
There are a huge number of ways that the connections within each scrambler rotor and between the entry plate and the keyboard or plugboard or lampboard could be arranged.
