Crazy Danish Hacker – GSM Sniffing 11 – Voice Decryption 101
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 decoded bursts to intelligible audio.
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Crazy Danish Hacker – GSM Sniffing 10 – SMS Decryption
Episode 10: SMS decryption. Feeding the captured Kc session key back into the GSM traffic capture to decrypt SMS bursts and recover the plaintext message.
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Crazy Danish Hacker – GSM Sniffing 9 – TMSI KC Extraction
Episode 9: extracting the TMSI and Kc session key for a target GSM subscriber by correlating paging messages and SDCCH activity, a prerequisite for later voice and SMS decryption.
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Crazy Danish Hacker – GSM Sniffing 8 – Using GR GRSM
Episode 8: using gr-gsm to capture GSM broadcast channels. Decoding the control channel data and viewing raw traffic in Wireshark with the gsmtap dissector.
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Crazy Danish Hacker – GSM Sniffing 7 – Installing GR GSM
Episode 7: installing gr-gsm on Linux. Building the GNU Radio-based GSM decoding toolset from source: dependencies, compilation, first sanity check.
