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- Un dispositif de type pinwheel (moulinet à roues crantées) est une roue munie de picots pouvant avoir deux états possibles qui permet, généralement associée à d'autres dispositifs du même type, de produire une suite pseudo-aléatoire de bits, afin d'alimenter une machine à chiffrer. Dans la M-209, c'est une action mécanique qui fait tourner la roue, tandis que la machine de Lorenz utilisait également un dispositif électronique. On peut voir ces dispositifs comme les ancêtres des registres à décalage à rétroaction linéaire.
* Portail de la cryptologie (fr)
- In cryptography, a pinwheel was a device for producing a short pseudorandom sequence of bits (determined by the machine's initial settings), as a component in a cipher machine. A pinwheel consisted of a rotating wheel with a certain number of positions on its periphery. Each position had a "pin", "cam" or "lug" which could be either "set" or "unset". As the wheel rotated, each of these pins would in turn affect other parts of the machine, producing a series of "on" or "off" pulses which would repeat after one full rotation of the wheel. If the machine contained more than one wheel, usually their periods would be relatively prime to maximize the combined period. Pinwheels might be turned through a purely mechanical action (as in the M-209) or electromechanically (as in the Lorenz SZ 40/42). (en)
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- Un dispositif de type pinwheel (moulinet à roues crantées) est une roue munie de picots pouvant avoir deux états possibles qui permet, généralement associée à d'autres dispositifs du même type, de produire une suite pseudo-aléatoire de bits, afin d'alimenter une machine à chiffrer. Dans la M-209, c'est une action mécanique qui fait tourner la roue, tandis que la machine de Lorenz utilisait également un dispositif électronique. On peut voir ces dispositifs comme les ancêtres des registres à décalage à rétroaction linéaire.
* Portail de la cryptologie (fr)
- In cryptography, a pinwheel was a device for producing a short pseudorandom sequence of bits (determined by the machine's initial settings), as a component in a cipher machine. A pinwheel consisted of a rotating wheel with a certain number of positions on its periphery. Each position had a "pin", "cam" or "lug" which could be either "set" or "unset". As the wheel rotated, each of these pins would in turn affect other parts of the machine, producing a series of "on" or "off" pulses which would repeat after one full rotation of the wheel. If the machine contained more than one wheel, usually their periods would be relatively prime to maximize the combined period. Pinwheels might be turned through a purely mechanical action (as in the M-209) or electromechanically (as in the Lorenz SZ 40/42). (en)
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- Pinwheel (cryptographie) (fr)
- Pinwheel (cryptography) (en)
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