Research On Caching Technology For Privacy In Content Centric Networking

Content-Centered network(CCN)is a new network model that attracts more and more researchers' attention in recent years.Compared with the traditional communication model which rely on host IP address,the cache data grouping pattern is considered to be a very significant advantages for CCN.It can effectively alleviate bandwidth competition and network congestion,reduce network traffic pressure and user access latency,relieve the server bottleneck.It also brings new problems and challenges which different from traditional network model.On the one hand,the network routing node caching mechanism can make the network to respond to user request with shorten the response time.However,leave copy everywhere(LCE)cache strategy exists the problem of "invalid cache" and "cache homogeneity".The problem weaken the advantage of the network in the cache;On the other hand,as an open data exchange platform,caching mechanism brings risks of privacy disclosure.An attacker can easily obtain the privacy information of the neighbor user who links the same cache route by time analysis and other attack methods.In view of above problems,this paper focuses on the relevant CCN caching technology and security prevention mechanism and aims at optimizing various network performance such as increase cache hit ratio and decrease network request delay,and improve the privacy security of CCN.The main research work of this paper includes:1)The thesis researches on the design principles and basic architecture of CCN.Introduce the communication mode and basic characteristics of CCN,and make a comparative analysis with other forms of network.It analyzes the research status of cache related problems in CCN at home and abroad.2)The thesis analyzes the existing CCSPP cache privacy protection scheme's problems of over-complex regional construction and regional network stability,and proposed an improved cache technology that takes both cache privacy protection and cache benefits into account.It designs simulation experiment on NDNsim platform for verification.3)The thesis researches on the "cache homogenization" problem and the generate reasons for the problem.This paper analyzes the existing caching strategies which can solve this problem and the shortcomings of solutions.According to the shortcomings of the existing solution,an improved caching technology is proposed.Simulation experiment is used to verify the effectiveness of the proposed technique.The main innovations of this paper are as follows:1)An improved cache technology for privacy protection is proposed.This caching strategy can realize cooperative caching of regional routing without complex regional routing construction methods.At the same time,deterministic caching and probabilistic caching are combined according to the popularity of the content.Simulation results show that this strategy improves the hit rate of network route cache and reduces the average request delay.2)An differentiated caching technology based on node degree is proposed.According to the degree difference of nodes,this method puts forward different cache standards for the popularity of content when making cache decisions.The content popularity requirement is higher when the nodes have larger degrees.By this way,it realize differentiated cache.Experimental results show that this method can improve the content richness of network cache and alleviate the problem of "cache homogeneity".