Pinwheel
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← Crypto Rotor →
Pin-and-lug cipher machines An special type of rotor-based cipher machines, are the so-called pinwheel machines, in which a complex system of movable pins controls the stepping of each wheel. Most pin-wheel machines are purely mechanical, which means that they do not require electricity for the encryption. In most cases, the number of steps is different for each wheel – usually a relative prime – in order to guarantee a maximum cipher period. Note that some machines belong to more than one class.
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