Caesar Cipher is an example of which category?

• A. Caesar Cipher
• B. Transposition Cipher
• C. Substitution Cipher
• D. Polyalphabetic Cipher

Answer: (C)

A Caesar cipher is a substitution cipher because it replaces every plaintext letter with a corresponding ciphertext letter using a fixed shift. This means the core operation is substitution—each symbol is consistently mapped to another symbol rather than changing the order of letters. It is not a transposition cipher, which would shuffle the letters’ positions without altering the letters themselves, and it is not polyalphabetic, which would use multiple shifts or alphabets for different positions. With a single, constant shift for all letters, the Caesar cipher clearly fits into the substitution cipher category.