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 quiz.Query is 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 quiz.Query is from Cryptography topic in chapter Cryptography of Data Structures & Algorithms II
Answer» Right option is (a) a substitution based cipher which uses multiple substitution at DIFFERENT POSITIONS The best I can EXPLAIN: 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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