基于改進(jìn)TrustGuard的郵件信譽(yù)機(jī)制研究.pdf

1、南開(kāi)大學(xué)碩士學(xué)位論文基于改進(jìn)TrustGuard的郵件信譽(yù)機(jī)制研究姓名：彭玉娣申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：計(jì)算機(jī)應(yīng)用技術(shù)指導(dǎo)教師：徐敬東20090601AbstractAbstractWiththepopularityoftheIntemetE—mailshavebecamemoreandmoreimportantinthelifeandworkofpeople，butatthesametime，theproliferationofspam

2、comestoanincreasinglyseriousproblemThemosteffectivewaytoholdbackspamisthetechnologicstrategies；however，thesestrategieshavesomelimitmionsThemailreputationmechanism，asanewantispammeans，playsanimportantroleintheareaofspamfi

3、lteringHowevertherearemanyproblemstobesolved，especiallythedesignofallefficientandrobustrepumtiongeneratingalgorithmInthebasisofanalysisofexistingmailreputationmechanismsandexistingreputationgeneratingapproaches，thispaper

4、amelioratestheTrustGuardalgorithmandproposestheMailTrustalgorithm，whichisareputation—generatingalgorithmMailTrustisareputation—generatingalgorithmbasedoncredibilityanditimprovesthecredibilityalgorithmofTrustGuardMailTrus

5、tCanfilteroutthedishonestfeedback，SOitCallgenerateareputationthataccuratelyreflectthesituationofthetargetnodeandachievethegoalofeffectivelyblockingspareMailTrusthastwomaincharacteristics：FirstlyitCancomputeareputationval

6、uethataccuratelyreflectsthetargetnodebyusinganeffectivecredibilityalgorithmSecondlyitconsidersthenewestbehaviorandthehistoricalbehaviorofthetargetnodeItalsousesthetrustfluctuationvalueThesethreepiecesofdataguaranteetimel

7、iness，stabilityofthereputationandpredictabilityofnodebehaviorThroughsimulationexperiments，weevaluatethecomputationalmethodoftherawtrustvalue，MailTrustwiththehistoricaltrustvalueandthetrustchangingrate，anddemonstratetheef

8、fectivenessofMailTrust，especiallytheeffectivenessoftheimprovedcredibilityalgorithmThroughsimulmionexperiments，weverifytheeffectivenessofthesysteminblockingspareserversKeyWords：Spam，ReputationMechanismTrustGuardAlgorithm，