Question

Poly alphabetic cipher harder to decipher than mono alphabetic cipher.

(a) true

(b) false

The question was asked during an interview.

The query is from Cryptography topic in section Cryptography of Data Structures & Algorithms II

Answer 1

Correct option is (a) true

Explanation: Mono alphabetic ciphers can be decoded by using the method frequency analysis. But in poly alphabetic cipher each symbol of plain text is replaced by a different cipher text regardless of its occurrence. This makes it very difficult to be decoded by using frequency analysis.