Caesar Cipher Encoder/Decoder

What is Caesar Cipher?

The Caesar Cipher is one of the simplest and most widely known encryption techniques. It is a type of substitution cipher in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet.

Key Points About Caesar Cipher:

• It's a substitution cipher where each letter is shifted by a fixed amount
• Traditional shift range is 1-25 positions
• ROT13 is a special case where shift is 13
• Preserves letter case and ignores non-alphabetic characters
• Simple to implement but not secure for serious encryption

How Caesar Cipher Works

The Caesar Cipher works by shifting each letter in the alphabet by a fixed number of positions. For example:

1. Encryption: With shift 3, A → D, B → E, C → F, etc.
2. Decryption: With shift 3, D → A, E → B, F → C, etc.
3. The shift wraps around the alphabet (Z shifts to A, B, C, etc.)
4. Numbers, spaces, and special characters remain unchanged

While not secure for modern cryptography, it's useful for learning about encryption concepts and historical significance.