Crazy Danish Hacker – Spy on anyone’s location

Episode 3: identifying GSM downlink frequencies. Using a spectrum viewer to scan the GSM 900 and 1800 bands and pick out active…

Episode 11: voice decryption basics. How A5/1-encrypted GSM voice traffic is structured on the traffic channel and what's needed to move from…

Episode 4: installing and using GQRX, an open-source SDR receiver front-end. First hands-on look at the GSM band with an RTL-SDR dongle.