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What will be the plain text corresponding to ciphered text “134325” if standard polybius square cipher is used for encryption?

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What will be the plain text corresponding to ciphered text “134325” if standard polybius square cipher is used for encryption?

(a) SRH

(b) CSK

(c) RCB

(d) KKR

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I want to ask this question from Cryptography in section Cryptography of Data Structures & Algorithms II

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The correct choice is (b) CSK

For explanation: For decoding ciphered text we have to use the polybius square in and find out the letters corresponding to each pair of coordinate. So in this case the plain text is found to be “CSK”.

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