Which of the following correctly defines poly alphabetic cipher?(a) a substitution based cipher which uses multiple substitution at different positions(b) a substitution based cipher which uses fixed substitution over entire message(c) a transposition based cipher which uses multiple substitution at different positions(d) a transposition based cipher which uses fixed substitution over entire messageThe question was posed to me in semester exam.Question is taken from Cryptography topic in chapter Cryptography of Data Structures & Algorithms II

Which of the following correctly defines poly alphabetic cipher?(a) a

1.	Which of the following correctly defines poly alphabetic cipher?(a) a substitution based cipher which uses multiple substitution at different positions(b) a substitution based cipher which uses fixed substitution over entire message(c) a transposition based cipher which uses multiple substitution at different positions(d) a transposition based cipher which uses fixed substitution over entire messageThe question was posed to me in semester exam.Question is taken from Cryptography topic in chapter Cryptography of Data Structures & Algorithms II
Answer» RIGHT choice is (a) a SUBSTITUTION based cipher which uses multiple substitution at different positions Best EXPLANATION: Poly ALPHABETIC cipher is a type of substitution cipher. It uses multiple substitution at different positions in ORDER to cipher the plain text.

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