managing trust and reputation in the

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1、ManagingTrustandReputationintheXenoServerOpenPlatformBorisDragovic,StevenHand,TimHarris,EvangelosKotsovinosandAndrewTwiggUniversityofCambridgeComputerLaboratory,Cambridge,UKffirstname.lastnameg@cl.cam.ac.ukAbstract.Participantsinpublicdistributedcomputingd

2、onotnditeasytotrusteachother.Themassivenumberofpartiesinvolved,theirheterogeneousbackgrounds,disparategoalsandindependentnaturearenotagoodbasisforthedevelopmentofrelationshipsthroughpurelysocialmechanisms.Thispaperdiscussesthetrustmanagementissuesthataris

3、einthecontextoftheXenoServerOpenPlatform:apublicin-frastructureforwide-areacomputing,capableofhostingtasksthatspanthefullspectrumofdistributedparadigms.Weexaminethemeaningandnecessityoftrustinourplatform,andpresentourtrustmanage-mentarchitecture,namedXenoT

4、rust.Oursystemallowsparticipantsofourplatformtoexpresstheirbeliefsandadvertisethem,bysubmit-tingthemtothesystem.Itprovidesaggregateinformationaboutotherparticipants'beliefs,bysupportingthedeploymentofrule-sets,deninghowbeliefscanbecombined.XenoTrustfollow

5、sthesamedesignprin-ciplesthatweareusingthroughouttheXenoServerproject:itprovidesa exibleplatformoverwhichmanyoftheinterestingdistributedtrustmanagementalgorithmspresentedintheliteraturecanbeevaluatedinalarge-scalewide-areasetting.1IntroductionTheXenoServer

6、project[9]isdevelopingapublicinfrastructureforwide-areadis-tributedcomputing,creatingaworldinwhichXenoServerexecutionplatformsarescatteredacrosstheglobeandavailabletoanymemberofthepublic.Usersofourplatformareabletorunprogramsatpointsthroughoutthenetworkino

7、r-dertoreducecommunicationlatencies,avoidnetworkbottlenecksandminimizelong-haulnetworkcharges.Theycanalsouseittodeploylarge-scaleexperimen-talservices,andtoprovideanetworkpresencefortransiently-connectedmobiledevices.Resourceaccountingisanintegralpartofthe

8、XenoServerOpenPlat-form,withclientspayingfortheresourcesusedbytheirprogramsandserveroperatorsbeingpaidforrunningtheprogramsthattheyhost.Thepublicandopennatureoftheplatformimposesaneedforatrustman-agementsyste