Encrypting data between you and websites

Day 149 of 149

👉 Full deep-dive with code examples

The Sealed Envelope Analogy

Sending a postcard:

Everyone can read it (mail carriers, neighbors)

No privacy!

Sending a sealed, locked box:

Only the recipient has the key

Contents are private

SSL/TLS is the sealed box for your internet data!

It encrypts the data sent over the connection between your browser (client) and a website (server), protecting it while it travels across the network.

Why It Matters

Without SSL/TLS:

Passwords can be sent in plain text

Credit card numbers can be exposed

Someone who can observe the network may be able to read or change what you send

On public WiFi, attackers can potentially intercept traffic

With SSL/TLS:

Data sent over the connection is encrypted (and integrity-protected)

It helps prevent eavesdropping and tampering while data is in transit

Reduces risk on public WiFi (but it doesn’t stop a compromised device or server)

How You Know It's Working

Look…