A plugboard is a device used with early computing and telecommunication systems, notably the Enigma machine used by the German military during World War II. In this context, the plugboard was a key component of the machine's encryption process. The plugboard allowed for pairs of letters to be swapped before or after they passed through the main rotor mechanism of the Enigma machine. This added an additional layer of complexity to the machine's encryption, enhancing its security.
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