GSM Sniffing: Voice Decryption 101 – Software Defined Radio Series #11

GSM Sniffing: Voice Decryption 101 – Software Defined Radio Series #11 In this video I show how to capture GSM traffic over the air, and decrypt parts of our own voice call. As frequency hopping is enabled in our case, a “test call” is decrypted subsequently, to show the full process until I get my new SDR, and record a new video. Please note that the pace in this video is quite fast at times, to keep the time on the video down a bit. It’s also highly recommended to check out the previous videos, in case this is the first time you’re doing GSM sniffing and decryption. Generally speaking, decoding voice where frequency/channel hopping is disabled/off, is almost the same as decrypting SMS’s. The only difference is an extra step at the end, where the TCH/F channel is used for speech data. New topics covered in this video: – Voice calls decryption (Traffic channels (TCH/F), channel hopping, etc.) – RTL-SDR limitations in relation to frequency hopping – Decrypting the test call file by “Security Research Labs” Topics already covered in the SMS decryption video: – Switching USB mode on a Samsung Galaxy phone – ARFCN conversion to downlink and uplink frequencies – Testing the GSM downlink frequency – Capturing RTL-SDR GSM traffic for later use – Decoding RTL-SDR GSM traffic – GSM packets (Immediate Assignment, Cipher Mode Command, etc.) – Decrypting GSM traffic with a known Kc (symmetric encryption key) Tools: – usbswitcher ( – minicom – kalibrate-rtl (kal) – grgsm_livemon – grgsm_capture – grgsm_decode – wireshark – vlc Hardware requirements: – RTL-SDR (Default antenna) for non-frequency hopping – Cellphone that has an AT interface you can access. Stay tuned and subscribe for more upcoming videos showing actual hacks! Twitter: @CrazyDaneHacker Facebook: Patreon:

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