Smart cities fully utilize the new generation of Internet of Things (IoT) technology in the process of urban informatization to optimize the urban management and service. However, in the IoT system, while information exchange and communication, wireless sensor network devices may not be able to resist all forms of attacks, which may lead to security issues such as user data disclosure. Aiming at the information security risks in smart city, the typical technologies in IoT is analyzed from the perspective of IoT perception layer and provides corresponding security solutions for the existing security threats. Regarding the communication security, the emerging wireless technology, long range (LoRa), is discussed, and the performance of wireless communication protocol is analyzed through simulation experiments, to verify that the IoT technology based on LoRa communication technology can improve the security of the system in the construction of smart city. The results show that REBEB, a new backoff algorithm, is similar to the binary exponential backoff algorithm in terms of throughput performance. REBEB focuses more on fairness, which is up to 0.985, and to a certain extent, its security is significantly improved. The fairness of REBEB algorithm is more than 0.4 in different nodes and competing windows, and the fairness of the system is better when the number of nodes is small. To sum up, the IoT system based on LoRa communication can effectively improve the security performance of the system in the construction of smart city and avoid the security threats in the IoT signal transmission.

中文翻译：

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人工智能赋能的智能城市物联网安全

智慧城市在城市信息化过程中充分利用新一代物联网（IoT）技术，优化城市管理和服务。然而，在物联网系统中，在进行信息交换和通信的同时，无线传感器网络设备可能无法抵御各种形式的攻击，从而可能导致用户数据泄露等安全问题。针对智慧城市的信息安全风险，从物联网感知层的角度分析了物联网中的典型技术，并针对现有的安全威胁提供了相应的安全解决方案。在通信安全方面，讨论了新兴的无线技术，长距离（LoRa），并通过仿真实验分析了无线通信协议的性能，验证基于LoRa通信技术的物联网技术在智慧城市建设中可以提高系统的安全性。结果表明，新的退避算法REBEB在吞吐量性能方面与二进制指数退避算法相似。REBEB更注重公平性，最高可达0.985，在一定程度上，其安全性显着提升。REBEB算法的公平性在不同节点和竞争窗口中均大于0.4，在节点数较少时系统的公平性较好。综上所述，基于LoRa通信的物联网系统能够有效提高系统在智慧城市建设中的安全性能，避免物联网信号传输中的安全威胁。