COMPUTER FUNDAMENTALS

Detailed explanation-1: -The replacement remains the same throughout the message, so the cipher is classed as a type of monoalphabetic substitution, as opposed to polyalphabetic substitution.

Detailed explanation-2: -Consider the word “India.” There are five letters in this word. Now, consider each letter of this word replaced by other letters in a specific pattern. For example, in a Caesar cipher, each alphabet is replaced by another alphabet three down the alphabetic series.

Detailed explanation-3: -The Vigenère cipher is probably the best-known example of a polyalphabetic cipher, though it is a simplified special case. The Enigma machine is more complex but is still fundamentally a polyalphabetic substitution cipher.