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SSL

security encryption web networking

What is SSL/TLS?

SSL/TLS is a way to keep your information safe when you send it over the internet. It scrambles your data so that only the website you’re sending it to can read it. This protects things like passwords, credit card numbers, and personal information from being stolen by hackers.

Simple Analogy

Think of SSL/TLS like sending a secret letter through the mail:


  • Without SSL/TLS (HTTP): Like sending a postcard with your private information written on it. Anyone who handles the postcard can read your message.

  • With SSL/TLS (HTTPS): Like using a special locked envelope system:

  1. The Locked Envelope (Encryption): You put your message in a special envelope that only the right person can open.

  2. Checking ID (Certificate Verification): Before sending your envelope, you check the recipient’s ID to make sure you’re sending it to the right person, not an impostor.

  3. Special Key Exchange (Handshake): You and the recipient agree on a special key to use, but in a way that’s safe even if someone intercepts your communication.

  4. Tamper-Proof Seal: The envelope has a special seal that breaks if anyone tries to open it along the way.

Key Concepts

  • Encryption: Scrambling data so only authorized people can read it
  • SSL Certificate: A digital ID card that proves a website is legitimate
  • Certificate Authority: A trusted organization that issues digital ID cards
  • Handshake: The process where your browser and the website verify each other and set up secure communication
  • HTTPS: The secure version of HTTP that uses SSL/TLS
  • Public Key: A key that can be shared with everyone
  • Private Key: A secret key that must be kept private