Warsaw team on Skype can send silent message
Tuesday, January 8, 2013 - 12:00
in Mathematics & Economics
(Phys.org)—A professor in Warsaw knows a way in which to communicate privately on Skype by using silence. Wojciech Mazurczyk at the Institute of Telecommunications, Warsaw University of Technology, discovered the packets technique for embedding secret data in phone calls on Skype. Mazurczyk and colleagues Maciej Karaś and Krzysztof Szczypiorski analyzed Skype data traffic and noted that, in a Skype call, between spoken words, Skype sends 70-bit-long data packets instead of the 130-bit ones that carry speech. Mazurczyk and team hid their data in the 70-bit packets during silent periods.