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Define Poly-alphabetic cipher.
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teamques10
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- A cipher which replaces one symbol with another is called as substitution cipher.
- In poly-alphabetic substitution, each occurrence of a character may have a different substitute.
- The relationship between a character in the plaintext to a character in the ciphertext is one-to-many
- E.g. the letter “a” could initially be substituted as “d” (a $\rightarrow$ d) , but in its later occurrence , “a” may be substituted with letter “s” (a $\rightarrow$ s) .
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