ICT Security-Sécurité PC et Internet

Chinese researchers have discovered a way to rapidly decrypt satellite phone communications -- within a fraction of a second in some cases.

The paper, published this week, expands on previous research by German academics in 2012 by rapidly speeding up the attack and showing that the encryption used in popular Inmarsat satellite phones can be cracked in "real time."

Satellite phones are used by those in desolate environments, including high altitudes and at sea, where traditional cell service isn't available. Modern satellite phones encrypt voice traffic to prevent eavesdropping. It's that modern GMR-2 algorithm that was the focus of the research, given that it's used in most satellite phones today.

The researchers tried "to reverse the encryption procedure to deduce the encryption-key from the output keystream directly," rather than using the German researchers' method of recovering an encryption key using a known-plaintext attack.

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