通信类英文文献及翻译样稿

姓名：刘峻霖 班级：通信143班 学号：101108附 录一、英文原文：Detecting Anomaly Traffic using Flow Data in the real VoIP

姓名：刘峻霖班级：通信143班学号：101108 附录 一、英文原文： DetectingAnomalyTrafficusingFlowDatainthereal VoIPnetwork I.INTRODUCTION Recently,manySIP[3]/RTP[4]-basedVoIPapplicationsandserviceshaveappearedand theirpenetrationratioisgraduallyincreasingduetothefreeorcheapcallchargeandtheeasy subscriptionmethod.Thus,someofthesubscriberstothePSTNservicetendtochangetheir hometelephoneservicestoVoIPproducts.Forexample,companiesinKoreasuchasLG Dacom,SamsungNet-works,andKThavebeguntodeploySIP/RTP-basedVoIPservices.It isreportedthatmorethanfivemillionusershavesubscribedthecommercialVoIPservices and50%ofalltheusersarejoinedininKorea[1].AccordingtoIDC,itisexpectedthatthe numberofVoIPusersinUSwillincreaseto27millionsin[2].Hence,astheVoIPservice becomespopular,itisnotsurprisingthatalotofVoIPanomalytraffichasbeenalready known[5].So,MostcommercialservicesuchasVoIPservicesshouldprovideessential securityfunctionsregardingprivacy,authentication,integrityandnon-repudiationfor preventingmalicioustraffic.Particu-larly,mostofcurrentSIP/RTP-basedVoIPservices supplytheminimalsecurityfunctionrelatedwithauthentication.Thoughsecure transport-layerprotocolssuchasTransportLayerSecurity(TLS)[6]orSecureRTP(SRTP) [7]havebeenstandardized,theyhavenotbeenfullyimplementedanddeployedincurrent