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Encryption in Autokey cipher is done using __________(a) a 5×5 table(b) a 13×2 table(c) vigenere table(d) a 6×6 tableI had been asked this question in a national level competition.This interesting question is from Cryptography topic in portion Cryptography of Data Structures & Algorithms II

Answer»

Correct answer is (c) VIGENERE table

For explanation: Encryption of plain text in playfair cipher is done using a 5×5 table. In this table, all the alphabets of the KEYWORD are arranged ROW wise by eliminating any duplicates then the REMAINING letters of the alphabet are placed. One of the alphabet has to be OMITTED in order to fit all the alphabets in the table.



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