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1、MoLe:MotionLeaksthroughSmartwatchSensorsHeWangTedTsung-TeLaiRomitRoyChoudhuryUniversityofIllinoisatUniversityofIllinoisatUniversityofIllinoisatUrbana-ChampaignUrbana-ChampaignUrbana-ChampaignChampaign,IL,USAChampaign,IL,USAChampaign,IL,USAhewang5@illinois

2、.edutedlai@illinois.educroy@illinois.eduABSTRACTcorequestionoftencomesto:whatcanbeinferredfromagivensensordata?Everysooften,we?ndthathighlysurprisinginfer-Imagineausertypingonalaptopkeyboardwhilewearingaencescanbemadefromanapparentlyharmlessdata,forcingsm

3、artwatch.Thispaperaskswhethermotionsensorsfromtheustopushbackoninformationexposure.Whilethisisabroadwatchcanleakinformationaboutwhattheuseristyping.Whileareaofresearch,andimmenseworkhasbeenperformedinthisitsnotsurprisingthatsomeinformationwillbeleaked,the

4、ques-direction,newplatformsandapplicationswarrantacontinuoustionishowmuch?We?ndthatwhenmotionsignalprocessingvigiloninformationleakage.ThispaperlooksintoanarrowiscombinedwithpatternsinEnglishlanguage,theleakageispieceofthisgeneralproblem.Weask:canaccelero

5、meterandsubstantial.ReportedresultsshowthatwhenausertypesawordgyroscopedatafromsmartwatchesbeminedtoinferthewordsW,itispossibletoshortlistamedianof24words,suchthatWthatauseristyping.Inotherwords,giventhatauser’swristisinthisshortlist.Whenthewordislongerth

6、an6characters,movesinthegranularityoffewcentimeterswhiletyping,canthemedianshortlistdropsto10.Ofcourse,suchleakshappenthecorrespondingmotiondatabeusedtoderivethekeysthatwithoutrequiringanytrainingfromtheuser,andalsoundertheuserhastyped?Ifso,therami?cation

7、sareserious–asmartthe(obvious)conditionthatthewatchisonlyonthelefthand.watchappcanbedisguisedasanactivitytrackertoheavilyWebelievethisissurprisingandmeritsawareness,especiallyinleakauser’semails,searchqueries,andotherkeyboard-typedlightofvariouscontinuous

8、sensingappsthatareemergingindocuments.Unlikekeystrokeloggersthatneedto?ndloopholestheappmarket.Moreover,wediscoveradditional“l(fā)eaks”thatintheoperatingsystem,theactivitytrackermalwarecanobtaincanfurtherreducetheshortl