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Poster:EnablingOn-BodyTransmissionswithCommodity Devices MehrdadHessar 1,VikramIyer 1,ShyamnathGollakota UniversityofWashington 1Co-primaryStudentAuthors {mehrdadh,vsiyer,gshyam}@uw.edu SummaryInthisposter,weshowforthetimethatcommoditydevicescan beusedtogeneratewirelessdatatransmissionsthatare tothehumanbody.,weshowthatcommodityinput devicessuchassensorsandtouchpadscanbeusedto transmitinformationtoonlywirelessreceiversthatareincontact withthebody. CategoriesandSubjectDescriptors C.2.1.[ NetworkArchitectureandDesign ]:WirelessCommuni- cation;B.0.[ Hardware ]:General Keywords On-bodycommunication;sensor;touchpad;capacitive coupling;physicallayersecurity 1.INTRODUCTION Wedemonstratethatsensorsavailableoncommoditysmartphones andlaptopscangeneratesignalsusableinon-bodycommunication systems.Wirelesstransmissionslimitedtothehumanbodyprovide uniquesecurityatthephysicallayerofacommunicationsystem makingitimmunetoeavesdroppingormaninthemiddleattacks. Potentialapplicationsincludeestablishingsecretkeysforsecure communicationwithwearabledevices[4]andkey-lessentrydoors. Fig.1illustratesanexampleofadoorauthenticatingauserin responsetoasecuretransmissionthroughtheirbodyfromasmart- phone.Adevicethatcouldberepurposedforon-bodycommunication mustsatisfythefollowingconstraints:1)thetransmitterandre- ceivershouldbeindirectcontactwithbody,2)thetransmitter shouldgeneratereliableelectromagnetic(EM)signalstoimplement acommunicationsystem,3)theEMsignalsshouldbewithintens ofmegahertzashighfrequenciesdonotpropagatewellthrough thebody[1].WeanalyzetheEMsignalsproducedbycommodity sensorsandtouchpadstoshowtheysatisfytheabove constraints.Weleveragethesetobuildprototypecommuni- cationssystemsthatachievedataratesupto50bps. Permissiontomakedigitalorhardcopiesofpartorallofthisworkforpersonalor classroomuseisgrantedwithoutfeeprovidedthatcopiesarenotmadeordistributed fororcommercialadvantageandthatcopiesbearthisnoticeandthefullcitation onthepage.Copyrightsforthird-partycomponentsofthisworkmustbehonored. Forallotheruses,contacttheowner/author(s). MobiCom’16October03-07,2016,NewYorkCity,NY,USA ©2016Copyrightheldbytheowner/author(s). ACMISBN978-1-4503-4226-1/16/10. DOI:http://dx.doi.org/10.1145/2973750.2985273(a)Authenticatingdoorlocks(b)Secretkeysforwearables Figure1:Exampleapplicationsforon-bodycommunication 2.COMMUNICATIONSYSTEMDESIGN Weexplainthedesignofouron-bodycommunicationsystem below. 2.1Transmitterdesign Capacitivesensorsandtouchpadsapplydrivesignals whensensingthatcouplewelltothebodyofauser,butdonot propagatewellthroughair.Toverifythis,werunexperimentsto comparethestrengthofreceivedsignalsonairversusthroughthe body.Fig.2showsthatsignalstrengthisfairlyuniformoverthe bodyatvariousdistancesbutdecreasesrapidlyovertheair. Figure2:ComparingthestrengthoftheEMsignals Weleveragethiscouplingtothebodytodemonstratetransmis- sionsofamplitudemodulatedsignalsthroughthebody., wecommunicateone/zerobitsusingsoftwarecontroltoperform/not performascanoperationontheVP5100USBsen- sor.AdditionallywepowercycleanAdafruittouchpadtoproduce amplitudemodulatedsignals. Figure3:Blockdiagramofthereceiver. 2.2Receiverdesign Weimplementourreceiverusingasoftwareradio(SDR) coupledtothebodyusingawriststrapcoveredinconductivecopper
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