The Invisible Negotiation Between Your Laptop and the Air

The Invisible Negotiation Between Your Laptop and the Air WiFi: Radio Physics, Collision Avoidance, and the Name That Means Nothing Reading time: ~15 minutes You typed a URL into your browser and hit Enter. Before a single byte of your request left your laptop, your WiFi card performed a dance of radio physics, collision avoidance, and cryptographic negotiation that would make a diplomat proud. It listened to the air to make sure nobody else was talking. It picked a random backoff timer in case someone else had the same idea. It encrypted your data with a key derived from a four-way handshake that happened when you first connected. Then it modulated your bits across 52 subcarrier frequencies simultaneously, transmitted them as radio waves, and waited for an acknowledgement -- all in under a millisecond. You saw a webpage load. Here's what actually happened. The Name Means Nothing Let's get this out of the way: WiFi doesn't stand for anything. If I'm found to be wrong the internet is we