Rotor Machines

Rotor machine From Wikipedia, the free encyclopedia (Redirected from Rotor machines) Jump to: navigation, search A serial of three rotors from an Enigma machine, employ by Germany during World contend II In cryptography, a rotor machine is an electro-mechanical device employ for encrypting and decrypting secret messages. Rotor machines were the cryptographic state-of-the-art for a brief but prominent period of history; they were in widespread use in the 1930s1950s. The most famous practice session is the Enigma machine. The primary component is a set of rotors, to a fault termed wheels or drums, which are rotating disks with an array of electrical contacts on all side. The wiring between the contacts implements a fixed substitution of letters, scrambling them in some complex fashion. On its own, this would offer little security system; however, after encrypting each letter, the rotors ad new wavece positions, changing the substitution. By this means, a rotor machine produces a complex poly rudimentic substitution cipher. Contents [hide] 1 Background 2 Mechanization 3 History o3.1 Invention o3.2 The Enigma machine o3.

3 miscellaneous machines 4 List of rotor machines 5 References 6 international links [edit] Background 40-point rotors from a machine made by Tatjana van Vark In classical cryptography, one of the earliest encryption methods was the frank substitution cipher, where letters in a message were systematically replaced using some secret scheme. Monoalphabetic substitution ciphers used totally a single replacement scheme â€" sometimes termed an alphabet; this could be easily broken, for example, by using frequency analysis. evenhandedly more secure were schemes involving multiple alphabets, polyalphabetic ciphers. Because such schemes were implemented by hand, only a handful of different alphabets could be used; anything more complex would be impractical. However, using only a few alphabets left the ciphers vulnerable to attack. The invention of rotor... If you want to repel a full essay, order it on our website: Orderessay

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