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Auto key cipher is more secure than polybius square cipher?(a) true(b) falseThis question was addressed to me at a job interview.This intriguing question originated from Cryptography in section Cryptography of Data Structures & Algorithms II

Answer»

The correct choice is (a) true

Easiest explanation - Polybius SQUARE is CLOSELY related to MONO alphabetic substitution CIPHER and thus is more vulnerable to frequency analysis. Whereas polybius square being a poly alphabetic cipher is less vulnerable to frequency analysis and so is more secure.



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