Overview of Computer Network Security Computer system security involves comprehensive and cross-disciplinary fields: cryptography theory, computer networks, operating systems, database technology, security protocols, communication technology, and electronic technology. Security architecture Security strategy and management, security risk analysis Legal issues related to computer security Overview of Computer Security Encryption technology Digital signature Network security protocol Firewall technology Virus knowledge Intrusion detection technology Network system security The four characteristics of the Internet: internationalization, socialization, openness, and personalization. Internationalization: Network attacks do not only come from users of the local network, but can come from any machine on the Internet. Socialization: With the rapid development of global informatization, the information system has become a national key infrastructure, such as telecommunications, e-commerce, and financial networks. The society\'s dependence on computer networks is increasing. Openness: Network technology is fully open and can be obtained by any person or group. Openness and resource sharing are the roots of network security. Personalization: With the deepening of network applications, human life is increasingly inseparable from the network. People can freely access the network, freely use and publish various types of information, but at the same time they are also facing security threats from the network.
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