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1、GameTheoreticResistancetoDenialofServiceAttacksUsingHiddenDicultyPuzzlesHarikrishnaNarasimhan?;1,VenkatanathanVaradarajan?;1,C.PanduRangan21DepartmentofComputerScienceandEngineering,CollegeofEngineeringGuindy,AnnaUniversity,Chennai,India.fnhari88,venk1989g@gmail.com2TheoreticalComputerScience
2、Laboratory,DepartmentofComputerScienceandEngineering,IndianInstituteofTechnologyMadras,Chennai,India.prangan@iitm.ac.inAbstract.DenialofService(DoS)vulnerabilitiesareoneofthemajorconcernsintoday'sInternet.Client-puzzleso eragoodmechanismtodefendserversagainstDoSattacks.Inthispaper,weintroducet
3、heno-tionofhiddenpuzzlediculty,wheretheattackercannotdeterminethedicultyofthepuzzlewithoutexpendingaminimalamountofcompu-tationalresource.Gametheoryisusedtodevelopdefensemechanisms,whichmakeuseofsuchpuzzles.Newpuzzlesthatsatisfytherequire-mentsofthedefensemechanismshavebeenproposed.Wealsosho
4、wthatourdefensemechanismsaremoree ectivethantheonesproposedintheearlierworkbyFallah.Keywords:DenialofService(DoS)Attack,Proof-of-Work,HiddenDif- cultyPuzzle,In nitelyRepeatedGame,NashEquilibrium1IntroductionDenialofService(DoS)vulnerabilitiesareoneofthemajorconcernsintoday'sinternet.TheaimofaD
5、oSattackistomakeanetworkserviceunavailabletoitslegitimateusers.Adenialofserviceattackmayeitherbeabruteforceattack,wheretheattackergeneratesspuriousnetworktractoexhaustserverresourcesorasemanticattack,wheretheattackerexploitsthevulnerabilitiesoftheprotocolused[18].Proof-of-workorclient-puzzles
6、o eragoodmechanismforaservertocoun-terbalancecomputationalexpenditurewhensubjectedtoadenialofserviceat-tack.Onreceivingarequest,theservergeneratesapuzzleofappropriatedi-cultyandsendsittotheclient.Whenaresponseisreceived,theserververi esthesolutionandprovidestherequestedserviceonlyifthesolutio
7、niscorrect.?WorksupportedbyIITMSummerFellowshipProgrammeMay-July20092Harikrishna,VenkatanathanandPanduRanganThus,theserverisassuredthattheclientiswillingtocommithisresourcestotheprotocol.Thisapproachwas rstproposedbyDworkandNaor[5]tocon
