Discussion on Network Security of Information Retrieval Technology in Network Communication

Network communication has become an important tool to ensure the efficient operation of modern society. The retrieval of network communication information is mainly based on the annotation and extraction of information characteristics in network communication, so as to carry out retrieval matching. The key of its application is to organize the information organically. Network communication information retrieval is not only a fast and effective way to obtain the required information, but also has important research value and role for the security of network communication. Based on this, this paper first analyses the information retrieval technology and network security technology in network communication, and then gives the practical application and development trend of the retrieval technology in network communication.


Introduction
With the continuous iterative development of computer technology, network computing model is becoming more and more complex and large-scale. The current research on information retrieval technology in network communication focuses on several typical features as shown in Figure 1. Network communication includes unstructured, structured and other types, so its storage and retrieval should also have a variety of forms, and take reliable retrieval means to ensure the security and reliability of computer communication network. This requires to strengthen the application of information retrieval technology in computer communication technology on the basis of full recognition of network security protocol function.

Information retrieval technology in network communication
Information retrieval technology in network communication is based on the information resources in computer network communication [2] . It records and expresses a variety of communication information resources in digital form to realize distributed storage in network computer storage medium, so as to obtain valuable network communication information and content.

Information retrieval tools in network communication.
Information retrieval tools in network communication mainly include web information retrieval tools and non-web information retrieval tools. Among them, the former mainly includes topic guide and search engine, while the latter mainly includes FTP retrieval tools, telnet retrieval tools and menubased retrieval tools. The characteristics of these tools are shown in Table 1. Table 1. Key characteristics of information retrieval tools.

Information retrieval engine
Information retrieval search engine is a tool for network communication information collection, information organization and information retrieval. It is mainly composed of search, index, retrieval and interface. Its architecture and working principle are shown in Figure 3 below.

Figure 3.
Architecture and working principle of information retrieval search engine. Based on the difference of classification methods, information retrieval search engines in current network communication can be divided into directory search engine, full-text search engine, independent search engine, meta search engine, comprehensive search engine, thematic search engine, monolingual search engine and multilingual search engine [3] . The typical characteristics of these different search engines are shown in table 2 below.  Table 2. Key characteristics of different search engines.

Network security technology 2.2.1. Influencing factors of network security.
At present, the network security factors in network communication mainly include human factors and operational errors, among which human factors mainly include various malicious attacks and hackers' invasion, which mainly based on scanning, breaking through, obtaining management rights, data theft, leaving backdoor programs, cleaning traces and so on, which constitute a real threat to network security [4] . At present, human factors have become one of the important factors affecting network security, especially information retrieval security in network communication.

Network communication security architecture
The network security architecture mainly includes several aspects as shown in Figure 4 below. Through the isolation and access control of different network security domains, network security detection, audit and monitoring, network anti-virus and network backup, the security system of information retrieval in network communication is constituted. In addition, based on the security configuration of the operating system, improve the security of the system, establish a secure system platform, and constantly discover and repair vulnerabilities to improve the security of the system. Network equipment regularly evaluates the network security through professional security tools, so as to ensure the security of network communication as much as possible. With the continuous popularization and deepening of the application of computer network communication technology, how to face the increasingly severe form of network security has become the focus and research difficulty of information retrieval in current network communication. Due to the development of network system, it is inevitable that it has its own vulnerability, so we need to comprehensively use a variety of security technology to deal with network security threats, so as to ensure the effective and stable operation of various applications and services of network communication.