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Running key cipher is an example of _______________(a) mono-alphabetic cipher(b) poly-alphabetic cipher(c) transposition cipher(d) additive cipherThis question was posed to me by my college director while I was bunking the class.My enquiry is from Cryptography topic in division Cryptography of Data Structures & Algorithms II

Answer»

Correct choice is (b) poly-ALPHABETIC cipher

The explanation is: Running key cipher is a SUBSTITUTION cipher. It falls under the category of poly alphabetic cipher as it uses MULTIPLE substitutions at different positions in order to cipher the PLAIN text.



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