Research On Trusted Cross Domain Method For Cloud-based Radio Over Optical Fiber Networks

The rapid development of the Internet of things has produced a large number of complex and diverse communication requirements,which brings great pressure to the underlying communication network.The cloud-based radio over fiber networks operated by a single internet service provider is difficult to provide high-quality services for all users due to resource bottlenecks,geographical constraints and other reasons.It is a feasible research direction to efficiently integrate and utilize the network resources operated by various network service providers to meet the challenges brought by the Internet of things.However.the traditional business cooperation mode needs a high cost of manpower and capital to maintain,and the traditional cooperation scheme is generally to establish a centralized third-party platform.centralize user information.and centralize the processing of user requests,which is difficult to accept for the network service providers who take user information as the core assets.In addition,because the Internet of things device is generally equipped with a simple security configuration,it is easy to be controlled by evil people and used for DDoS attacks,so the network security is also facing serious challenges.As an emerging decentralized network technology,blockchain can establish a secure and trusted transaction environment among multi-party organizations at low cost,which is very suitable for building resource transaction network among multi network service providers.This paper starts from the resource and security challenges faced by the cloud-based radio over fiber networks in the face of the rapid development of the internet of things,combined with the requirements of blockchain technology and the new environment,studies the cross domain resource transaction model between multi service providers.This paper analyzes the trust,efficiency and security problems existing in the established cross domain resource transaction in detail,puts forward the design innovation in the direction of building a trusted transaction network in the blockchain,and builds an experimental simulation platform for feasibility verification and performance simulation.The main contents and innovations of this paper are as follows.First,it analyzes and summarizes the technical requirements of current cross domain network in security,trust,energy and other aspects.On this basis,the consortium-blockchain based cross-domain trusted transaction architecture is designed,and the functional modules of the controller in the cloud-based radio over fiber networks are improved to realize the trusted cooperative transaction environment.On this basis,two kinds of digital currencies are designed for cross domain transactions,including resource coin and credit coin.The membership level management model based on the credit coin is studied,and the admission and exit rules of members who can participate in network maintenance are standardized.Finally,smart contracts for efficient information sharing is formulated to give the proposed architecture the ability to integrate the whole network resources in real time.Based on the above mechanism.the proposed architecture can solve the cross domain network resource trusted transaction,and effectively improve the overall network resource utilization.Secondly,it analyzes and summarizes the deficiencies of blockchain technology in terms of transaction efficiency and the requirements of the proposed cross domain trusted transaction architecture in terms of information sharing and single point of failure,and finds out its advantages in terms of trust.On this basis,smart contracts and channel contracts for cross domain transactions are designed,and the capacity expansion mechanism based on smart contracts is proposed to improve the transaction efficiency of the network.The simulation results show that under the normal traffic load environment,the transaction efficiency of this scheme is at least ten times higher than that of the direct application blockchain scheme,and the network blocking rate is reduced by 20%,and the service delay is reduced by 35%.Thirdly,aiming at the risk of DDoS attack on IoT devices caused by capacity expansion mechanism based on smart contract,this paper analyzes the on chain environment and off chain environment respectively,and summarizes the possible vulnerabilities.On this basis,when facing the on chain environment,the reward and punishment strategy is designed based on the credit coin to guide the user's trading behavior,and the feasibility of the proposed strategy is analyzed theoretically.Aiming at the environment under the chain,a mathematical problem based on SHA algorithm is proposed as an additional condition for users to access the network,which raises the cost of malicious users attacking the network.In addition,bloom filter is used to implement blacklist and whitelist,which speeds up the speed of finding and distinguishing the user's device identity,and reduces the resources consumed by malicious users launching useless contract attacks.Simulation results show that this scheme can effectively protect the access of normal users when the ratio of normal users to evil users is between 1 and 5.and limit the access of evil users to resist and weaken the impact of attacks.