一種新的防肩窺圖形口令機制的設(shè)計與實現(xiàn).pdf

1、西安電子科技大學碩士學位論文一種新的防肩窺圖形口令機制的設(shè)計與實現(xiàn)姓名：常秀玲申請學位級別：碩士專業(yè)：計算機軟件與理論指導教師：劉西洋201101AbstractShouldersurfingiSaknownriskwhereanattackercarlcaptureapasswordbydirectobservationorbyrecordingtheauthenticationsessionDuetothevisualinterfa

2、ce，thisproblemhasbecomeexacerbatedingraphicalpasswordsHowever，mostoftheexistinggraphicalpasswordschemesarevulnerabletoshoulder。surfingTherehavebeensomegraphicalschemesresistantorimmunetoshouldersurfing，buttheyhavesignifi

3、cantusabilitydrawbacks，usuallyintheeffortandtimetologin，orinmemorabilitywhichobstructtheirpopularityInthispaperweproposeanewshouldersurfingresistantgraphicalpasswordscheme，calledCDS(ComefromDASandStory)，whichhasadesirabl

4、eusabilityforhandhelddevices，suchasPDAsAsanextensionandimprovementofDASandStoryCDSinheritsthedrawingmethodinDASandthesequentialcomponentsinStorytogetherwiththeassociationmnemonicsforsequenceretrievalByintroducingredundan

5、tinformationinauthenticationCDSprovidesaresistancetoshouldersurfingFurthermore，itrandomlyselectstwoimagesastheoriginandterminalpositionsfortheinputanddynamicallyerasesthedrawingtrace，toavoidrevealingpasswordsthroughusers

6、’behaviorInadditionthecomplementarymeasuresinCDSsuchastherandomdistributionofimages，useofdegradedimages，limitationtothedrawingtracelength，improvethesecurityfurtherBesidesthedesignprinciple，thepaperalsopresentsthedetailed

7、implementationofCDS，basedonwhichaseriesofexperimentsareconductedTheexperimentresultsandtheassociateanalysisillustratethatCDScanprotectpasswordsagainsthumanobservation，anduserscancreatepasswordssuccessfullyaswellasremembe