Blockchain Based Security Enhancement And Performance Optimization For Wireless Networks

The development of wireless networks has brought about earth-shaking changes in human society,and made us step into the era of Internet of everything and smart interconnection.With the continuous enhancement of informatization,the new requirements of social development promote the emergence of next generation wireless network.At the same time,network security is paid much attention.In order to meet the needs of diversified terminal equipment interconnection and intercommunication,the future wireless network will provide strong support for the communication between massive devices.But it still faces great challenges in terms of user privacy protection.Blockchain technology is considered to play an important role in the future wireless network due to its decentralized network structure,identity confirmation mechanism,information integrity protection capability and anti-tampering capability.In order to give full play to the advantages of blockchain in resource sharing and privacy protection and enhance the security of wireless communication systems,it is necessary to conduct research on blockchain based security enhancement and performance optimization for wireless networks.Considering the heterogeneous access requirements of a large number of terminal devices in wireless network,how to quickly and accurately achieve user security authentication is particularly critical for ensuring the security performance of wireless network.In response to the above problems,the main research content and innovations of this thesis are as follows:Aiming at the risk of privacy leakage caused by plaintext transmission in the process of authentication and access in wireless network,using the data anti-tampering capabilities of blockchain,a blockchain-based trusted user security authentication mechanism is proposed.In the proposed solution,a reputation evaluation model is constructed and introduced.Considering the situation that a single user has multiple terminal devices,the users and devices in the network are respectively identified by reputation.Then,differentiated authentication is realized based on the hierarchical and dynamically updated reputation mark.And zero-knowledge proof in the process is used to complete the user's privacy protection.Theoretical analysis and simulation results show that,the ability of the proposed authentication scheme to prevent malicious users/devices from accessing the network is more than 90%.Using device identification as the digital identity in the blockchain network enables the proposed mechanism to also support diversified device access requirements,and it can be used as a unified authentication framework in future wireless network.Aiming at the trade-off between security and delay caused by the introduction of blockchain,a low-latency security authentication strategy based on optimal decision-makers is proposed.A bribery model is constructed from the perspective of system security vulnerabilities.Under the premise of different weights of voting node and fixed costs,the incomplete information game between the bribery party and the bribery party is analyzed.Then combined with the analysis of the communication overhead of consensus algorithm,a decision-makers'selection strategy and a security authentication scheme are proposed that take both security and low latency into consideration.Theoretical analysis and simulation results show that the proposed authentication scheme can select the core decision makers of the consensus algorithm from all voting nodes on the basis of ensuring the security of the system.Compared with the traditional method in which all nodes act as decision makers,it reduces the additional delay in the consensus process,and realizes low-latency security authentication.Aiming at the problem of a significant increase in the probability of access collision caused by the rapid increase in the number of network devices,using the advantages of smart contracts in resource sharing,a random access resource allocation scheme with low collision probability is proposed.In the proposed solution,smart contract is introduced and the service priority of users/devices is classified.According to the service priority and the credibility identification of users/devices,the access permission condition restriction is set,and the access resources are allocated to the services that meet the permission condition.Theoretical analysis and simulation results show that the use of access permission restrictions can reduce the number of access requests in the network at the same time,thereby reducing the probability of access collisions.The classification of services by priority can shorten the response time of high-priority service and improve the system's responsiveness to high-priority services.