Question

In Cryptography, Caesar cipher is a

• A. Substitution cipher
• B. Kirchhoff's principle
• C. Kerberos
• D. Transposition cipher

Hint:

Caesar Cipher = Monoalphabetic Substitution Cipher

Answer 1

The Correct Option is A

Concept: Classical cryptography mainly uses two techniques:
• Substitution
• Transposition Caesar cipher is one of the oldest substitution ciphers.

Step 1: Understand Caesar Cipher.
Each alphabet is shifted by a fixed number of positions. For example, with shift = 3: \[ A \rightarrow D \] \[ B \rightarrow E \] \[ C \rightarrow F \] and so on.

Step 2: Why is it called substitution?
Every character is replaced by another character. Hence it is a substitution technique.

Step 3: Choose the answer.
Therefore, \[ \boxed{\text{Substitution Cipher}} \] is correct.