Symmetric Hash Functions for FingerprintMinutiae指纹地对称散列函数 细节点.pdf

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1、SymmetricHashFunctionsforFingerprintMinutiaeSergeyTulyakov,FaisalFarooqandVenuGovindarajuSUNYatBuffalo,BuffaloNY14228,USAAbstract.Thepossibilitythatadatabasewithbiometricdataiscom-promisedisoneofthemainconcernsinimplementingbiometricidentifi-cationsystems.Inthispaperwepresentamethodofhash

2、ingfingerprintminutiainformationandperformingfingerprintidentificationinanewspace.Onlyhasheddataistransmittedandstoredintheserverdata-base,anditisnotpossibletorestorefingerprintminutialocationsusinghasheddata.Wealsopresentaperformanceanalysisoftheproposedalgorithm.1IntroductionTheproblemwe

3、aredealingwithiswelldescribedinsection9.7ofHandbookofFingerprintrecognition[1].Plaintextpasswordscanbehashed,andonlyhashvaluesarestoredinthedatabaseandtransmittedacrossnetworks.Passwordauthenticationrequirescomparisonofthehashedvaluesandnotoriginalpass-words.Ifdatabasewithhashvaluesise

4、vercompromised,allpersonscanbereenrolledusingdifferentpasswordsordifferenthashfunction.Situationisdifferentwhenusingbiometricdataforpersonauthentication.Duetothedifficultyofdevisinghashingfunctionsforbiometricdatabiometrictemplatesareusuallystoredunprotectedinacentraldatabase.Evenifstoredte

5、mplatesareencrypted,matchingisstillperformedusingdecryptedtemplates,anddecryptionprocesscanbecompromisedaswell.Ifthebiometricdatabaseiscompromisedandanintruderobtainsaperson’sbiometrictemplate,usingthisbiometricwillbeimpossiblefortherestofperson’slife.Inthisworkwewanttodeviseamethodfor

6、biometricdata,inparticularfingerprintdata,tobehashed,andthebiometricidentificationtobeperformedusinghashedbiometricdata.Hashingfunctionsareone-wayfunctions,andgiventhehashvaluesitisimpossibletoreconstructoriginaltemplate.Onlythehashvaluesaretransmittedoverthenetworkandstoredinthebiometri

7、cdatabase.Incasethehashvaluesarecompromised,personwillbere-enrolledusingnewhashfunction.Theoriginalbiometric(e.g.fingerprint)issafeandnevercompromised.Figure1presentsadiagramofasystemusingproposedhashingalgorithm.Fingerprintsareobtainedbythescanner,minutialocationsarefoundandhashesofm