https://media.ccc.de/c/34c3/34c3-9273-kracking_wpa2_by_forcing_nonce_reuse

We introduce key reinstallation attacks (KRACKs). These attacks abuse features of a protocol to reinstall an already in-use key, thereby resetting nonces and/or replay counters associated to this key. We show that our novel attack technique breaks several handshakes that are used in a WPA2-protected network.

Mathy Vanhoef

https://fahrplan.events.ccc.de/congress/2017/Fahrplan/events/9273.html