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On Encrypting “cryptography” using Vignere Cipher System using the keyword “LUCKY” we get cipher text

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On Encrypting “cryptography” using Vignere Cipher System using the keyword “LUCKY” we get cipher text

(a) nlazeiibljji

(b) nlazeiibljii

(c) olaaeiibljki

(d) mlaaeiibljki

The question was asked in an online interview.

The above asked question is from Substitution and Transposition Techniques in section Classical Encryption Techniques of Cryptograph & Network Security

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The correct option is (a) nlazeiibljji

Explanation: Cipher text:=   Ci = Pi + ki mod m (mod 26).

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