A simple Python implementation of the Caesar Cipher — one of the oldest known encryption techniques — built to understand the fundamentals of classical cryptography.
This program encrypts text using the Caesar Cipher, a substitution cipher where each letter is shifted a fixed number of positions down the alphabet. This version uses a fixed shift of 4 (a → e, b → f, c → g, and so on).
While trivially easy to break by modern standards, understanding the Caesar Cipher is a foundational step into cryptography — it introduces core concepts like substitution and shifts that apply to far more complex encryption systems used today.
- 🔒 Encrypts lowercase text using a fixed shift of 4
- 🐍 Pure Python — no external dependencies
- The shift is fixed at 4 — not currently customizable by the user
- Encrypt only — no decrypt function yet
# Clone the repo
git clone https://github.com/adwaithsuvish/caesar-cipher.git
cd caesar-cipher
# Run it
python main.pyYou'll be prompted to enter text, and the encrypted result will be printed.
Enter the text to encrypt: hello
Output: lipps
- [✔] Support uppercase letters, spaces, and punctuation
- [✔] Let the user choose a custom shift value instead of a fixed one
- Add a decrypt function
- Add a brute-force mode to crack messages without knowing the shift
Classical ciphers like this are the starting point for understanding modern cryptography — before working with real algorithms (AES, RSA, etc.), it helps to understand basic ideas like substitution and shifting, and why simple ciphers like this are easy to break.
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