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What will be the plain text corresponding to cipher text “ACCFYX” if trithemius cipher is used?

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What will be the plain text corresponding to cipher text “ACCFYX” if trithemius cipher is used?

(a) ABACUS

(b) ABROAD

(c) ABRUPT

(d) ABUSED

I had been asked this question during an interview.

Enquiry is from Cryptography topic in portion Cryptography of Data Structures & Algorithms II

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The correct answer is (a) ABACUS

For explanation: Running key cipher is a type of poly alphabetic substitution which uses tabula recta for making substitutions in the plain text. Using the table and key as ABCDEFGHIJKLMNOPQRSTUVWXYZ we find the plain text to be “ABACUS”.

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