Research On The Dynamics Of Trust Chain In Cloud Computing

Cloud computing is different from the traditional computing model,which privide cloud services for users through the integration of virtualization technology and modern network technology.Due to the rapid development of these two core technologies,cloud computing has become a research hotspot.By virtualization technology,cloud platform realizes the encapsulation of the underlying computing,network and storage resources.Then the virtual machine is used to provide users with powerful and scalable network service resources.However virtual machine has become attack objects of malicious tenants after its wide application.The trusted computing technology is an important measure to guarantee credibility.However,the direct application of the traditional trust chain transfer mode into the cloud computing can not solve real-time and sustainable dynamic credibility issues faced the open cloud environment effectively.The corresponding trust chain dynamic maintenance measures are needed,which can guarantee safety of the cloud-client virtual machine in the interaction process.Therefore,this paper mainly studied threats of the cloud-client virtual machine;then,this paper implemented the trust chain dynamic maintenance and verification measures based on the guest virtual machine behaviors in the cloud computing environment.The detailed research contents were as follows:First,propose a trust chain dynamic maintenance model based on the noninterference theory.Aiming at the environment of virtual machines,this paper concluded four factors that would affect safety of virtual machine interaction.Further,this paper designed the trust chain dynamic maintenance model by combining safety factors based on the noninterference theory.This model conducted bilateral control on input and output of virtual machines;further,this paper verified its credibility by using the noninterference theory.Then design a trust chain dynamic verification mechanism based on the trust chain dynamic maintenance model;the trust chain's remote verification only provides static integrity for users.Aiming at this deficiency,this paper formulated a verification mechanism with double assurance.By combining credibility of dynamic behaviors of virtual machines in the cloud environment and learning from historical behavior records provided by the trust chain dynamic maintenance model,this mechanism can provide more comprehensive cloud platform status information and more suitable cloud services.And lasly,analyze and compare functions of the trust chain dynamic maintenance model and the trust chain dynamic verification mechanism by designing two experimental groups;verify effectiveness and practicability of cloud environments against threats by comparing with others.Finally,this paper conducted the performance test and comparison on system cost brought by the model.The data were used to clarify feasibility of this model.