🔐 How Secret Ciphers Work
Secret codes hide real messages by replacing or shifting letters:
- Caesar Cipher: Every letter in the alphabet is shifted by a fixed number (e.g. shift 3 turns A ➔ D, B ➔ E).
- Substitution Cipher: Every letter is mapped to a random different letter (e.g. E ➔ X, T ➔ Q).
- Frequency Tip: The letter E is the most common letter in English words!