Packet analysis is tricky enough without layering on WiFi.
First you need to know if you have a WiFi card that can capture the WiFi radio header, then you have to figure out if you can capture in promiscuous mode, then you need to understand if the wireless network has client isolation or similar configurations. Whew…
That where having a specifically designed Wifi tool helps. In this example I used a Fluke Networks One Touch to capture some packets. Capturing them was the easy part. Now I have to decrypt them.
I chose to use Wireshark and want to share with you how to decrypt a trace file when the client is using WPA2 encryption.
As I said in the video, the key (no pun) here is to start your capture before the client authenticates with the access point.