What are the main information security technologies?

Information security technology mainly includes the following contents:

Information acquisition technology: Information acquisition technology can be divided into active acquisition technology and passive acquisition technology. Active access technology obtains information by injecting the feedback of data packets into the network. This technology is simple to access and can obtain a wide range of information, but it will cause additional load to the network. Passive access technology is to obtain network information through bypass interception at the network entrance and exit. Its characteristic is that access needs the cooperation of network management, and the content obtained is limited to the data flow in and out of the local network, which will not cause additional traffic to the network. At present, most gateway content security products adopt passive access to network information.

Information content analysis and identification technology: In order to prevent illegal content from appearing in the application, firstly, content security equipment is needed to identify illegal content, mainly including text, sound, images and graphics. Accuracy and speed of recognition are important indicators. Character recognition includes the recognition of key words, characteristic words and attribute words, the recognition of grammar, semantics and pragmatics, and the recognition of theme, position and attribute. The technologies involved in character recognition include string matching, rule matching, clustering algorithm, natural language processing and so on. At present, anti-spam and web content filtering products basically adopt text-based identification methods. Content-based audio and video information retrieval is an important research field in the development of multimedia databases. At present, the related audio-visual, video and image content identification and analysis technologies have partially entered the practical stage, mainly used for film and television piracy monitoring, advertising monitoring, pornographic picture monitoring and so on.

Content classification technology: the main function of information content classification is to prevent the content prohibited by the national constitution and other laws and regulations from spreading on the Internet through technical means such as filtering and shielding, and to classify the content that does not violate the law, but may easily cause some adverse effects or injuries to the country, society, companies, families and individuals, or according to clear and detailed rules, only certain people are allowed to contact it; It is convenient for the audience to be familiar with the security level of information before accepting it, and to ensure the right to know and choose; In order to protect minors, some filtering software can be installed to isolate information that causes harm to minors.

Information filtering technology: For the identified illegal information content, different ways need to be taken for subsequent processing to prevent or interrupt users' access, and filtering is a common blocking method. Information filtering technology mainly includes URL-based site filtering technology, content keyword-based filtering technology, URL-based content keyword-based filtering technology, image recognition-based filtering technology, tendency filtering technology and combination filtering technology combining several technologies. At present, the research and application of tendentious filtering technology are still less.

Content audit technology: content audit mainly refers to the identification, recording, storage and analysis of information related to security-related activities; Audit results are used to check what security-related activities have taken place on the network. By recording all the resources and access process accessed by users, the dynamic real-time monitoring of the network is realized, which provides a means for users to obtain evidence afterwards and also ensures the security of information.