Research On Cloud Computing Application Technology In The Internet Of Things Based On Trust

The rapid development of the Internet of Things is unstoppable.However,the realization of all these Io T devices poses a huge challenge to security.The traditional trust management literature discusses abnormal node behavior and Io T attacks,but they have not solved the security problems of the Io T well.Aiming at the shortcomings listed above,A trust-based security model is proposed in the Internet of Things environment.The innovations and work done in the thesis are summarized as follows:First of all,in view of the efficient allocation of spectrum resources in the Internet of Things,a trust-based spectrum resource allocation mechanism(TSRA)is designed,which constructs the central network into a combined auction model,and narrows the scope of the customer network through the trust relationship between users.In addition,for users' private information and transaction records,the attribute encryption theory is designed to provide fine-grained protection for data.The improved ant colony algorithm reasonably plans the allocation path for users,so as to efficiently and safely realize the multi-target allocation of spectrum resources in the Internet of Things.Secondly,in view of the trust problem of edge fog computing devices distributed in cloud computing,a layered trust model of P2P(Peer to Peer)network based on fog architecture is poposed.The cloud center initially assigns a trust value and a unique signature to each fog node.When a fog node provides services to the device nodes of its group,neighbor nodes decide whether to share the content of the node based on the node's direct trust and recommendation trust,and detect and update dishonest nodes.After the service ends,the device layer feedbacks the trust to the fog node to update the trust value.Finally,in view of the server security issues in edge computing,a server-based on security trust evaluation framework is proposed.First,a lightweight reputation evaluation mechanism is used to collaborate with Io T(Internet of Things)edge servers,and reputation is aggregated through a fusion algorithm based on the theory of objective information entropy.The homomorphic encryption algorithm is used to protect the privacy of user data,and the trust value is calculated by an adaptive method based on the trustworthy user's expectation score of the server,which can overcome the limitations of traditional trust schemes.