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Pin-wheel machines
Pin-and-lug cipher machines

An alternative class of rotor-based cipher machines, is the so-called pin-wheel machine, 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 electric energy for the encryption. In most cases, the number of steps is different for each wheel – commonly a relative prime – in order to guarantee a maximum cipher period. Note that some machines belong to more than one class.

Pin-wheel machines on this website
B-21, Hagelin's first cipher machine B-211, the successor to the B-21 Russian copy of the Hagelin B-221 C-35 C-36 C-37 M-209 (CX-38) BC-39 (motorised version of BC-38 / M-209)
C-443 C-446-A and C-446(RT) C-52, CX-52, BC-52 and accessories TC-52, a hybrid on-line cipher machine BC-543, the successor to the BC-38 CD-55 pocket cipher machine (less-secure version of the CD-57) CD-57 pocket cipher machine STG-61 hand-held cipher machine (CD-57 clone)
H-54 pin-wheel cipher machine (CX-52 clone) Telekrypto-Gerät 35, developed by Edgar Gretener (Gratag) and Boris Hagelin. Transvertex HC-9 pin-wheel cipher machine
Further information
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© Crypto Museum. Created: Wednesday 21 February 2018. Last changed: Wednesday, 21 March 2018 - 16:57 CET.
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