@deni It's from the #35C3 talk [Hunting the Sigfox: Wireless IoT Network Security](https://ftp.fau.de/cdn.media.ccc.de/congress/2018/slides-h264-hd/35c3-9491-eng-deu-fra-Hunting_the_Sigfox_Wireless_IoT_Network_Security_hd-slides.mp4) (30:10 min)