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

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

(a) BNJSWOAPV

(b) BMHPSJUIN

(c) AMIRVNZOU

(d) MBPHJSNIU

I have been asked this question by my school principal while I was bunking the class.

Question is taken from Cryptography in portion Cryptography of Data Structures & Algorithms II

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Correct option is (c) AMIRVNZOU

For 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 “AMIRVNZOU”.

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