What is poly graphic substitution cipher?(a) a substitution based cipher which uses multiple substitutions at different positions(b) a substitution based cipher which uses fixed substitution over entire plain text(c) a substitution based cipher in which substitution is performed over a block of letters(d) a transposition based cipher which uses fixed substitution over entire plain textI had been asked this question in an interview for job.The query is from Cryptography in section Cryptography of Data Structures & Algorithms II

What is poly graphic substitution cipher?(a) a substitution based ciph

1.	What is poly graphic substitution cipher?(a) a substitution based cipher which uses multiple substitutions at different positions(b) a substitution based cipher which uses fixed substitution over entire plain text(c) a substitution based cipher in which substitution is performed over a block of letters(d) a transposition based cipher which uses fixed substitution over entire plain textI had been asked this question in an interview for job.The query is from Cryptography in section Cryptography of Data Structures & Algorithms II
Answer» The CORRECT choice is (C) a substitution based cipher in which substitution is performed over a block of letters The best I can EXPLAIN: Poly graphic cipher is a type of substitution cipher in which substitution is performed over a block of letters. Hill cipher is an EXAMPLE of poly graphic cipher.

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