How to send secret messages!
Imagine you have a secret alphabet where every letter is shifted by 3:
A → D, B → E, C → F, etc.
"HELLO" becomes "KHOOR"!
This is called a cipher - a way to hide the real message!
Modern encryption uses really fancy math!
Everyone has TWO keys:
🔓 Public Key: Share with everyone
🔒 Private Key: Keep secret!
Anyone can lock a message with your public key, but only YOU can unlock it with your private key!
💬 WhatsApp, iMessage: Only you and recipient can read
🔒 HTTPS: Secure websites
💳 Banking: Protects your money
🔐 Passwords: Stored encrypted