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 messageI have been asked this question during a job interview.Asked question is from Cryptography topic in portion 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 messageI have been asked this question during a job interview.Asked question is from Cryptography topic in portion Cryptography of Data Structures & Algorithms II
Answer» Right answer 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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