基于多维历史向量的P2P分布式信任评价模型

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9期谭振华等:基于多维历史向量的P2P分布式信任评价模型1733

图8三类节点的全局信任度测试

法对团队恶意节点的欺骗行为进行判断.

(3)实验3.相关性信任度有效性验证.

首先,在实验2的环境下,观察一个A类节点n1和A类节点口2、C类节点f2的相关性因子,结果如图9所示.

循环次数

图9相关性因子测试

图9结果表示,随着不断的实验,节点口1与口2的相关性因子越来越高,而口1与f2的相关性因子一直处于低等水平,表明相关性因子的设计合理.

同时,实验观察口1对口2、n1对c2的相关性信任度评价,结果如图10所示.

图10相关性信任度MDHT(al,a2)与

MDHT(al,c2)测试

结果表明,由于有团队的影响,n2和f2都具有高的全局信任度,但是,由于加入了相关性因子,使得最终的MDHT(口1,a2)与MDHT(al,c2)能清楚地区分可信节点与团队恶意节点,相关性信任度具有更高的客观性.

(4)实验4.与其它模型的性能比较.

本文将MDHTrust中的相关性信任模型与EigenRep模型[1引、Jiang的模型[173、NBRTrust模型[2引、随机模型进行比较实验.实验统计在不同信任模型下所有A类节点选择从恶意节点(B类和C类)进行交易的次数在总交易次数中所占的比重(如所有A类节点总共交易了100次,其中有20次选择了B类和C类交易,则比例为20%).实验结果如图11所示.

图11不同模型选择恶意节点进行交易的比例

从图11的实验结果看,随机模型具有最差的收敛性,而MDHTrust的收敛效果较好.虽然EigenRep模型和Jiang的模型都能有效收敛,但由于这两个模型都没有引入相关性参数,使得其对实验环境中的团队恶意节点(C类节点)的协同行为反应较慢.尽管在Jiang模型中引入了对评价的信任判断来处理协同恶意行为,同时通过线性时间因子对评价进行了因式处理,但相比MDHTrust的相关性因子和非线性时间因子,其收敛速度相对较慢.NBRTrust模型因本身较为简单,只计算了成功率和相关性因子,这使得其收敛效果较差.该结果表明,相比EigenRep模

型、Jiang模型、NBRTrust模型和随机模型,本文所万方数据

万方数据

9期谭振华等:基于多维历史向量的P2P分布式信任评价模型1735

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TANZhen-Hua,bornin1980,

Ph.D.,lecturer.Hiscurrentresearch

interestsincludedistributednetworkse—

curityandcomputerarchitecture.

WANGXing-Wei,bornin1968,Ph.D.,professor,P}LD.supervisor.HiscurrentresearchinterestsincludeNGI,mo—bilewirelessInternet,andIP/DWDMopticalInternet,etc.

Background

TheP2Ptechnologicalframeworkwouldbeakeycompo—nentofthefutureInternetsystem,andthepeer-to-peernet—workhasbeenpopularinmanylarge??scaledistributedapplica—-tionsbecauseofitsopenness,anonymousandreciprocity.However,variouskindsofmaliciousappearinkindsofP2Psystems,disturbingthetrustmechanismoftheP2Pnetwork.Moreandmoreresearchersmakecontributionstothesecuritytechnologies,anddistributedtrustmodelisoneofthekeytechnologies.

Basedonsomesocialnetworkprinciples,thispaperpres—entedanewdistributedtrustmodelnamedMDHTrust(Mul岱Dimension-HistoryTrustModel).

ThisworkissupportedbytheNationalNaturalScience

[20]TanZhen—Hua,ChengWei,ChangGui—Raneta1.Adistrib—utedtrustmodelforP2Poverlaynetworksbasedoncorrela-

tivityofcommunicationhistory.Journal

ofNortheasternUniversity(NaturalScience),2009,30(9):1245—1248(in

Chinese)

(谭振华。程维。常桂然等.基于通信历史相关性的P2P网

络分布式信任模型.东北大学学报(自然科学版),2009,30

(9):1245-1248)

[21]LiYong-Jun,DaiYa—Pei.ResearchontrustmechanismforPeertcrPeernetwork.ChineseJounalofComputers,2010,

33(3):390—405(inChinese)

(李勇军,代亚非.对等网络信任机制研究.计算机学报,

2010,33(3):390-405)

[22]DengAi—Lin,ZhuYang—Yong,ShiBo-Le.Acollaborativefilteringrecommendationalgorithmbasedonitemratingpre—

diction.JournalofSoftware。2003,14(9):1621-1628(in

Chinese)

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荐算法.软件学报,2003,14(9):162卜1628)

[23]BenestyJ,ChenJD,HuangYT.OntheimportanceofthePearsoncorrelationcoefficientinnoisereduction.IEEE

TransactionsonAudio.Speech&LanguageProcessing.

2008,16(4):757—765

CHENGWei,bornin1970,Ph.D.candidate,lecturer.HiscurrentresearchinterestsincludecomplexnetworksandSoCdesign.

CHANGGui-Ran,bornin1946,Ph.D.,professor,Ph.D.supervisor.Hiscurrentresearchinterestsincludecomputerarchitectureandnetworksecurity,etc.

ZHUZhi-Liang,bornin1962,professor,Ph.D.super—visor.Hiscurrentresearchinterestsincludechaosinforma—tionprocessingandcomplexnetwork.

FoundationofChinaundergrantNos.61070162,71071028,60802023and70931001;theSpecializedResearchFundfortheDoctoralProgramofHigherEducationundergrantNa20070145017:theFundamentalResearchFundsfortheCen—tralUniversitiesundergrantNo.N090504003andNo.N090504006.TheseproiectsfocusontrustedcomputingtosolvesecuritytechnologiesofthenextgenerationInternet,inclu—dingP2Psecufity.Authorsofthispaperworkfordistributednetworksecurity,nextgenerationInternetandsoOILTheybe—gantheresearchonP2Pnetworksecuritysince2000。andhaveachievedmanyscientificresearchachievements.Thispapercon—tributestotheP2PtrustroodelwhichcanbeappliedonP2PE-commerce,P2PsharingsystemandP2Psearch

engine.万方数据

基于多维历史向量的P2P分布式信任评价模型

作者:谭振华, 王兴伟, 程维, 常桂然, 朱志良, TAN Zhen-Hua, WANG Xing-Wei, CHENG Wei, CHANG Gui-Ran, ZHU Zhi-Liang

作者单位:谭振华,程维,朱志良,TAN Zhen-Hua,CHENG Wei,ZHU Zhi-Liang(东北大学软件学院,沈阳,110819), 王兴伟,WANG Xing-Wei(东北大学信息科学与工程学院,沈阳,110819), 常桂然

,CHANG Gui-Ran(东北大学计算中心,沈阳,110819)

刊名:

计算机学报

英文刊名:CHINESE JOURNAL OF COMPUTERS

年,卷(期):2010,33(9)

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