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1、移动终端自带传感器带来的隐私新威胁徐文渊wyxu@zju.edu.cn7/13/151 Privacy is not a new concern Source: 3M privacy filter for laptops promo=onal campaign 7/13/152 SmartphoneUsage•Howmanypeopleusesmartphones?Source: Business Insider Source: Gartner •ShipmentofsmartphonePC(Desktop & Noteboo
2、k) Tablet Mobile Phone 2,250,000 isincreasingeveryyear.2,000,000 1,750,000 1,500,000 75% of the mobile phones are 1,250,000 1,000,000 smartphones and highly‐Thousands of Units 750,000 featured phones 500,000 250,000 0 2012 2013 2014 2015 Year 7/13/15Reference:Anupa
3、m Das 3 Smartphones are used everywhereSource: mylookout.com7/13/154 Privacy expecta=ons of mobile users ACloserLookatSmartphones•Today,smartphonescomewithawiderangeofsensors.Allofwhichareusefulforavarietyoftasks.•Mo=on detec=on •Gesture detec=on •Audio Genre detec
4、=on •Loca=on detec=on •Interac=on with nearby devices •Compass7/13/15Reference:Anupam Das 6 Most apps use mo=on sensors 7/13/157 Most apps use accelerometer 7/13/158 Whatcansmartphonesensorsdo?1.Sidechannelsforsensingenvironment2.Potentialsourcesfordevicefingerprin
5、ts.Should sensors be accessed freely?7/13/159 Sensors: Side Channels1.Accelerometers 2.Gyroscopes 7/13/1510 (sp)iPhone: Decoding Vibra=ons From Nearby Keyboards Using Mobile Phone Accelerometers Philip Marquardt, ArunabhVerma, Henry Carter and Patrick TraynorCCS2
6、011 7/13/1511 Decoding Keyboards Keystrokes Using Mobile Phone Accelerometers 7/13/1512 Keystrokes Sensed by AccelerometersKeystrokes7/13/1513 Keystrokes Sensed by AccelerometersSingle char “I” Single char “a”7/13/15Character pair “nm”Character pair “pq”14 A`ack sc
7、enariosSMS, hi AliceInstall a malicious appRecord accelerometer data and recover keystrokes7/13/1515 Results (USA Today)7/13/1516 Gyrophone: Recognizing Speech From Gyroscope Signals Anupam Das, Nikita Borisov, Ma`hew Caesar CCS 2014 7/13/1517 Gyroscope in Smartph
8、ones•Deviceusedtomeasureormaintainorientation•Worksontheprincipalsofangularmomentum微机电陀螺仪(MEMS)7/13/1518 微机电陀螺仪(MEMS)7/13/1519 Acous=c Vibra=on•G