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 text
Which of the following correctly defines poly graphic substitution cipher?
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answerhappygod
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Which of the following correctly defines poly graphic substitution cipher?
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