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What will be the ciphered text corresponding to “SANFOUNDRY” if trithemius cipher is used for encryption?

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What will be the ciphered text corresponding to “SANFOUNDRY” if trithemius cipher is used for encryption?

(a) SBPISZTKZH

(b) TCQJTAULAI

(c) TBOGPVOESZ

(d) SPBISZKTZH

The question was asked in semester exam.

This interesting question is from Cryptography in portion Cryptography of Data Structures & Algorithms II

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The correct answer is (a) SBPISZTKZH

Best explanation: Encryption in trithemius cipher takes place exactly as in vigenere cipher if we consider the key to be ABCDEFGHIJKLMNOPQRSTUVWXYZ. So by using the tabula recta we can find the encrypted text which is “SBPISZTKZH”.

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