Q889
Which of the following correctly defines 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
AnswerD.
a transposition based cipher which uses fixed substitution over entire plain text
Answer: Option C
Solution
Answer: Option C
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