Rotor machine,subsitution technique

easy to know about rotor machine

1. ROTOR MACHINE,SUBSITUTION TECHNIQUE M.SUJITHA, II-M.SC(CS&IT), Nadar Saraswathi College Of Arts And Science, Theni

2.   A   rotor machine  is an electro-mechanical  stream cipher  device used for  encrypting  and decrypting secret messages. Rotor machines were the cryptographic state-of-the-art for a prominent period of history; they were in widespread use in the 1920s–1970s. The most famous example is the German  Enigma machine , whose messages were deciphered by the Allies during World War II, producing intelligence code-named  Ultra . ROTOR MACHINE

3. A substitution  cipher is a  method  of encrypting by which units of plaintext are replaced with ciphertext , According to a fixed system; the "units" may be single letters pairs of letters, triplets of letters. SUBSITUTION TECHNIQUE