一種新的防肩窺圖形口令機(jī)制的設(shè)計(jì)與實(shí)現(xiàn).pdf

1、西安電子科技大學(xué)碩士學(xué)位論文一種新的防肩窺圖形口令機(jī)制的設(shè)計(jì)與實(shí)現(xiàn)姓名：常秀玲申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：計(jì)算機(jī)軟件與理論指導(dǎo)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