Hard-to-know person

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Possible Answers: ENIGMA.

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This article contains technical details about the rotors of the Enigma machine.

Understanding the way the machine encrypts requires taking into account the current position of each rotor, the ring setting and its internal wiring.

The right side of a rotor, showing the pin electrical contacts. The Roman numeral V identifies the wiring of the rotor.

The left side of an Enigma rotor, showing the flat (plate) electrical contacts. A single turnover notch is visible on the left edge of the rotor.

Since the same wires are used for forwards and backwards legs, a major cryptographic weakness is that no letter can map to itself.

In order to understand the effect of rotation on the rotors we demonstrate this by some examples.

As an example, let us take rotor type I of Enigma I (see table below) without any ring setting offset. You can see that an A is encoded as an E, a B encoded as a K, and a K is encoded as an N. Notice that every letter is encoded into another.

ENIGMA on Wikipedia