37.8 MB (2.4 MB compressed)
4034 x 3275 pixels
34.0 x 27.7 cm ⏐ 13.4 x 10.9 in (300dpi)
SCIENCE SOURCE / SCIENCE PHOTO LIBRARY SCIENCE SOURCE / SCIENCE PHOTO LIBRARY
Enigma wheels within alphabet rings in position in an Enigma scrambler. In the Wehrmacht Enigma, the three installed movable rotors are sandwiched between two fixed wheels: the entry wheel, on the right, and the reflector on the left. The Enigma machines were a series of electro-mechanical rotor cipher machines developed and used in the early-to mid-20th century to protect commercial, diplomatic and military communication. Enigma was invented by the German engineer Arthur Scherbius at the end of World War I. Early models were used commercially from the early 1920s, and adopted by military and government services of several countries, most notably Nazi Germany before and during World War II. Several different Enigma models were produced, but the German military models, having a plugboard, were the most complex. Alan Turing was a key player in cracking the Enigma code at Bletchley Park in the UK.
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