Which cipher makes use of modular arithmetic with a modulus of 26 and is the simple cipher based on mono-alphabetic?AShiftBAdditiveCTranspositionDNone the above
Question
Which cipher makes use of modular arithmetic with a modulus of 26 and is the simple cipher based on mono-alphabetic?AShiftBAdditiveCTranspositionDNone the above
Solution
The answer is B. Additive. This cipher is a type of mono-alphabetic substitution cipher where each letter in the plaintext is 'shifted' a certain number of places down or up the alphabet. In this case, the shift is a constant, so the same plaintext letter will always be transformed into the same ciphertext letter. This shift is often defined using modular arithmetic with a modulus of 26, because there are 26 letters in the English alphabet.
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