1

I know the password to a certain router which uses WPA2-PSK-CCMP + WPS + ESS, is it possible to watch the communication between devices and the router unencrypted assuming I know the password to the router?

I tried to sniff traffic in monitor mode and for some reason I didn't see a key transferred (which means I cannot crack the communication). Is there something I'm missing?

If you can break it, how is it possible? If not, why?

2

You need the handshake packages captured. You can force a client to re-authenticate again with a lot of tools so you will instantly get this.

Then you just need a tool that can decrypt WPA and give the key to this tool.

Wireshark is an example for such a tool: Image from their wiki

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