# Research of Security Routing Protocol for UAV Communication Network Based on AODV
## 1 Introduction  
With the progress and development of science and technology, UAV is becoming more and more mature in technology and widely used in production and life. UAV has the advantages of low cost, small size, light weight, easy to operate, high flexibility, high adaptability, high stability, and easy concealment. Therefore, it plays an important role in dealing with film and television shooting, agricultural monitoring, electric cruise, meteorological monitoring, forest fire detection, and emergency rescue [1; 2; 3; 4]. With the wide application of UAV in production and life, how to improve the communication quality of UAV communication network has become a research hotspot. The UAV communication network is an extended application of mobile ad-hoc networks (MANET) in the field of UAV [5; 6; 7]. Each UAV node in the UAV communication network has an equal status. It does not need to set up any node responsible for central control, and it has a strong anti-destructive ability. Network nodes not only have the functions required by ordinary mobile terminals, but also have the ability of data packet forwarding. When the source node and the destination node are not in the range of direct communication with each other, data packets can be forwarded through the intermediate node for communication. Sometimes data packets need to be forwarded by multiple nodes to reach the sink node [8; 9; 10]. The UAV communication network adopts the form of a dynamic network to complete the interconnection of the internal members of the cluster. The advantages of its networking areself-intelligent organization, automatic healing, and high performance, and low latency, which can meet the needs of a UAV cluster in special scenarios [11; 12; 13]. The UAV communication network has the characteristics of open channel, dynamic topology, no center authorization, distributed cooperation, and limited bandwidth. Therefore, the security of its routing protocol is much more complex than traditional networks, and some existing security solutions for wired networks cannot be directly applied to UAV communication networks. However, the existing routing protocols in MANET only focus on the function and efficiency of route discovery, and hardly mention the security of the protocols [14; 15; 16; 17]. The AODV routing protocol is widely used in UAV communication networks because of its simplicity and low control overhead. However, it does not have any security mechanism, and it is easily attacked by various malicious nodes [18; 19; 20]. Figure 1 shows the attacked UAV communication network. When the UAV communication network is attacked by malicious nodes, the wireless signal is easily intercepted and interfered. At this time, the UAV communication network is more vulnerable to network attacks such as eavesdropping, active intrusion, and denial of service. Therefore, designing an efficient and secure routing protocol for UAV communication networks is particularly critical [21; 22; 23; 24]. [PERSON] et al. [25] proposed a secure protocol based on an optimization algorithm, Monarch-Earthworm Algorithm (Monarch-EWA), which is the modification of the Monarch Butterfly algorithm using the Earthworm Optimization Algorithm (EWA) in order to render effective security to the network. [PERSON] et al. [26] researched, compared, and classified enhanced vehicle routing protocols with different security mechanisms, including authentication, integrity, confidentiality, non-repudiation, and availability of data and communications. [PERSON] et al. [27] proposed a trust detection-based secured routing (TDSR) scheme to establish security routes from source nodes to the data center under malicious environment to ensure network security. [PERSON] et al.