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1、AbstractAsanewcomputingmode,cloudcomputingprovidesuserswithavarietyofservicesinaopenmode,butthemodehassomesecurityrisks.Virtualmachinesystemisthecoreofcloudcomputing,soitsseciwityisthekeytocloudenvironment.ThepaperstudiesthesecuiityofvirtualizationtoimproveVMownsecurityfromtwoaspects:imp
2、rovingVMkeysecuritywithenhancingrandomnessoftherandominVMentropypool,andreducingtheprobabilityofVMunderattackwithshorteningthetimeofVMmigration.AimingatthesecurityproblemsofthedataoftheVM,thepaperpresentsarandomnumbergenerationmethod,basingonvirtualmachinesandvirtualmachinenetworkaccess,
3、togeneratehigh-randomrandomsequence.Firstly,wecombinetheVMnetworkenvironmentwithuseraccessbehavioroftheVMtoconstructanenvironmentaccesstorandomBasingonthisrandomenvironment,weproposeanewrandomnumbergenerationalgorithm,whichtakesadvantageoftheunpredictabilityofthevirtualmachinenetworkandn
4、on-simulatedofuseraccess,thenusesvirtualmachinedpowerfulcapacityofprocessingmassivedatatocombineandscreenrandominformation,finallyresultsrandomsequencewithrandomness.Inthepaper,wetestedtheuniformity,independenceandcryptographicallyofthegeneratedrandomsequence,experimentalresultsshowthatt
5、hisalgorithmmeetstheneedsofsecurity.Inaddition,thepaperpresentsanalgorithm,theVMfestmemorypre-copylivemigration,itcombinespagereplacementwithpre-copyalgorithm.Accordingtotheideology:withtherecentpastastheapproximateofnearfutureinLRUalgorithm,thepaperusesthemodificationfrequencyofmemorypa
6、gesovertimetodeterminethemodificationfrequencyfuture,andintroducesmark-bitqueuetosavethechangesrecordedofmemorypages.Initerativeprocess,dirtymemorypages,judgedasSequentchanges,willbeskipped,untilthemodificationfrequencydropstothethresholdorbeoutputuntilthefinalroundofiteration.Inthepaper
7、,wetestedthenumberofiterations,thetotalmigrationtime,downtimeandtotalamountofdatatransmissioninthemigrationprocess.Fromtheexperimentalresultswecansee,fastmemorypre-copyalgorithmproposedinthepaper,reachesthepurposeofreducingtheprobabilityofaVMunderattack.Keywords:Cloudcomp
