2. Information security mainly studies the basic knowledge and technology of information systems, information security and confidentiality, network security, etc. , and take various protective measures to protect information, networks, servers, etc. For example: the construction of computer firewall, the design of intrusion detection system, the detection and analysis of network virus, the research and development of anti-virus software, the monitoring and investigation of enterprise intranet, the mining and repair of software vulnerabilities, etc.