资料：Directions:Thereis1passageinthispart.Thepassageisfollowedbysomequestionsorunfinishedstatements.Foreachofthemtherearefourchoices,Youshoulddecideonthebestchoice. Yourfaceisthefutureofsmartphonesecurity.ApplemadethatclearlastweekwhenitunveiledthepriceyiPhoneX.Appleclaimstohaveconqueredmanyofthechallengesthathavepreventedthewidespreaduseoffacialbiometrics.Butanumberofcomputer-visionresearcherssaytheyareskepticalthatasmartphone-basedsystemlikeFaceIDcanaccountforthingslikevariablelightingconditionsorsubtlechangesinaperson'sappearancetocreateasecure-yet-practicalwaytounlockaphoneadozenormoretimesaday. Apple’snewtechnologydoessoundpromising.ThecompanysaysFaceIDcreatesa“precisedepthmap”ofone’svisagebyprojectingmorethan30,000infrareddotsagainstaperson’sface,thenusingthephone’sinfraredTrueDepthcameraandhigh-powermicrochiptocollectandanalyzetheresults.Usersarealsoaskedtoturntheirheadastheyscansothephone'smachine-learningalgorithmcanmeasurethefacefromseveralanglesandcreateamoredetailed3-Dmapoftheirfeatures.Oncethemapiscreatedandstored,theiPhoneXusesinfraredlighttohelpFaceIDscanaperson’sfaceeveninthedark.Meanwhile,machine-learningalgorithmsrunningonthephonekeeptrackofchangesinaperson'sappearance—includingglasses,facialhairandhats—sothesmartphone’saccuracyimprovesovertime. Despiteadvancesinfacialrecognitioninrecentyears,itremainsunclearwhetherFaceIDwillworkinavarietyofconditionswhilealsokeepingtheiPhoneXsecure.Hackers,forexample,quicklyfoundawaytobypasstheSamsungGalaxyS8'sfacial-recognitionscannerwhenitwasintroducedinMarch:Theytrickedthedevicebysimplyshowingitaphotooftheuser.FaceID’suseof3-Dfacialmapscouldaddressthatproblem.Buthistoricallyithasbeenabigchallengeforsuchasystemtorecognizefacesunderdifferentlightingconditionsandfromavarietyofangles. AppleshowedoffFaceIDlastweekunderrelativelycontrolledconditions,saysArunRoss,aprofessorofcomputerscienceandengineeringatMichiganStateUniversity."Clearlythedemowasveryinteresting,"hesays."Butatthesametimesomeextraordinaryclaimsweremade."Apple'sSchillersaid,forexample,thatthechancearandomperson'sfacecouldunlocksomeoneelse'siPhoneXwasoneinamillion——muchmoresecurethanTouchI D.Rosssays,however,thatitisnotclearhowoftenFaceIDfailstorecognizeitsowner.Whencontacted,AppledeclinedtoelaborateonSchiller'scomments. “Likeallbiometrics,FaceIDwillhaveaproblemwithrevocation,”saysVitalyShmatikov,acomputerscienceprofessoratCornellTech.“Ifapasswordiscompromised,itcanbechanged—butafacecannotbechanged.”AppletoutsitsabilitytosecuredataonitsiPhones,whichdonotsharebiometricinformationwiththecompany’sservers.Still,Rosssays,hackersalwaysseemtofindawayaroundeventhetightestsecurity. Whatistheauthor'sattitudetowardApple'sFaceIDtechnologyoniPhoneX?
A.Promising B.Skeptical C.Supportive D.Neutral正确答案B
