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SAN FRANCISCO Womens Darryl Strawberry Jersey , Aug. 17 (Xinhua) -- Adding to the concern that network-enabled electronic devices could be co-opted to steal data or invade privacy, computer scientists have demonstrated how it is possible to transform such a device into a surveillance tool.


Such a tool can collect information about the body position and movements of the user.


In addition, by remotely hijacking a smart device to play music embedded with repeating pulses that track a person's position, body movements, and activities both in the vicinity of the device as well as through walls Womens Keith Hernandez Jersey , the researchers at the University of Washington (UW) have shown how to track other people in the device's immediate vicinity.


Having created CovertBand, a software code able to turn smart devices into remote-controlled active sonar systems with built-in microphones and speakers, they plan to present their work at the Ubicomp 2017 conference, an Association for Computing Machinery (ACM) event on pervasive and ubiquitous computing, on Sept. 13 in Hawaii.


"The physical information CovertBand can gather - even through walls - sufficiently detailed for an attacker to know what the user is doing Jay Bruce Authentic Jersey , as well as other people nearby," senior author Shyam Gollakota, a UW associate professor of computer science and engineering, was quoted as saying in a news release this week.


Active sonar systems, such as those on submarines Yoenis Cespedes Authentic Jersey , determine the position of objects by sending out an acoustic pulse. Those sound waves bounce off objects in their path, and the deflected waves can be picked up by a receiver to determine the object's position, distance and shape.


Through the speaker of a smartphone or other device, CovertBand sends out a repeating pulse of sound waves in the 18 to 20 kHz range. These sound waves are reflected when they encounter objects in their path. CovertBand uses the device's built-in microphones as a receiver to pick up these reflected sound waves. The smart device then transmits this information to the attacker, who could be a few feet Jacob deGrom Authentic Jersey , or meters, away or halfway across the globe.


The research team tested CovertBand's effectiveness using a smartphone hooked up to either a portable speaker or a standard flat-screen TV. In both cases, CovertBand's data could be used to decipher repetitive movements such as arm-pumping, walking or pelvic tilts to a range of up to 6 meters from the smartphone, with a positional error of 8 to 18 centimeters.


They also discovered that Noah Syndergaard Authentic Jersey , with the portable speaker, CovertBand's pulses can transmit through thin, interior walls - though the range drops to 2 to 3 meters.


The 18 to 20 kHz repeating pulses are on the low range of what many people can hear accurately. To increase the range of surveillance and work through walls, the team increased the volume of these repeating pulses, which made them audible. To mask the sound Michael Conforto Authentic Jersey , they "covered" the pulses by playing songs or other audio clips over them. Some songs work better than others, particularly compositions with repetitive, percussive beats.


The researchers said soundproofing a room and emitting a jamming signal at the same 18 to 20 kHz frequency range would prevent hacked devices or attackers in the next room from gathering information. Another potential defense could be to allow users to deactivate the speakers or microphones on their smart devices.

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