🔐 Your browser doesn’t just “encrypt with the server’s key” — what actually happens is far more interesting
HTTPS/TLS solves three problems, not just one:
🔒 1. Confidentiality — no one in the middle can read the data ✅ 2. Authentication — you’re talking to who you think you are 🔄 3. Integrity — the data wasn’t tampered with in transit
🤝 The TLS handshake step by step:
- Client says “hello” and lists supported algorithms
- Server picks one and sends its certificate (signed by a CA)
- A shared session key is generated via asymmetric cryptography
- The whole session is encrypted with that symmetric key (much faster)
📜 What’s inside a certificate? Domain name, public key, validity period, and the digital signature of a trusted CA.
⚠️ Why do self-signed certificates trigger errors? Because no recognized CA vouches for the identity. Anyone can create one — there’s no chain of trust.
💡 Explanation in a nutshell#
HTTPS is like sending a letter in a sealed envelope, but first verifying that the post office is legitimate. TLS uses two types of encryption: a slow one (asymmetric) to agree on a secret key, and a fast one (symmetric) for the rest of the conversation. Certificates are like the server’s ID card, validated by trusted authorities.
More information at the link 👇
