Compression lets attackers tap VoIP calls
A common compression technique can make internet telephone calls significantly more susceptible to bugging, according to recent research from Johns Hopkins University.
Internet telephony has become widely used through consumer-centric applications such as Skype, and is becoming more common in enterprises.
The new research suggests, however, that standard encryption and compression methods, when used together, are not sufficiently secure. VoIP calls are commonly encrypted using a technique that preserves the lengths of voice patterns in the original, unencrypted conversation, the researchers said.
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