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1、WhenGoodBecomesEvil:KeystrokeInferencewithSmartwatchXiangyuLiuZheZhouWenruiDiaoTheChineseUniversityofTheChineseUniversityofTheChineseUniversityofHongKongHongKongHongKonglx012@ie.cuhk.edu.hkzz113@ie.cuhk.edu.hkdw013@ie.cuhk.edu.hkZhouLiKehuanZhangACMMemberTheChineseUniversityoflzc
2、arl@gmail.comHongKongkhzhang@ie.cuhk.edu.hkABSTRACTCategoriesandSubjectDescriptorsOnerisingtrendintoday’sconsumerelectronicsisthewearableD.4.6[OperatingSystem]:SecurityandProtection—Invasivesoft-devices,e.g.,smartwatches.Withtensofmillionsofsmartwatcheswareshipped,however,thesecur
3、ityimplicationsofsuchdevicesarenotfullyunderstood.AlthoughpreviousstudieshavepointedoutsomeKeywordsprivacyconcernsaboutthedatathatcanbecollected,likeperson-alizedhealthinformation,thethreatisconsideredlowastheleakedSmartwatch;KeystrokeInference;Side-channelAttacksdataisnothighlyse
4、nsitiveandthereisnorealattackimplement-ed.Inthispaperweinvestigateasecurityproblemcomingfrom1.INTRODUCTIONsensorsinsmartwatches,especiallytheaccelerometer.Theresultsshowthattheactualthreatismuchbeyondpeople’sawareness.Keyboardisextensivelyemployedforinputtingsensitiveinfor-Beingwo
5、rnonthewrist,theaccelerometerbuiltwithinasmart-mation,likePINsandsecretdocuments,anditisnaturallyaverywatchcantrackuser’shandmovements,whichmakesinferringus-attractivetargettocyber-criminals.Keyloggercandirectlystealtheerinputsonkeyboardspossibleintheory.Butseveralchallengeskeystr
6、okesbutithastomaintainfootageinvictim’smachine.Onneedtobeaddressedaheadinthereal-worldsettings:e.g.,smal-theotherhand,side-channelbasedkeystrokeinferenceattackcol-landirregularhandmovementsoccurpersistentlyduringtyping,lectsthesignalsemanatedfromkeyboardsusingexternaldeviceswhichd
7、egradesthetrackingaccuracyandsometimesevenover-andisstealthier.Therehavebeenaplentyofworksexploringfea-whelmsusefulsignals.siblechannelsforsuchattacks.Forexample,theworkbyAsonovInthispaper,wepresentanewandpracticalside-channelattackandAgrawaldemonstratedthatsoundproducedbyhittingd
8、ifferenttoinferuserinputsonkeyboa
