Information security mainly includes the following five aspects: the need to ensure confidentiality, authenticity, integrity, unauthorized copying and the security of parasitic systems. Information security itself contains a wide range, including how to prevent the disclosure of secrets of commercial enterprises, prevent teenagers from browsing bad information, and disclose personal information. The information security system under the network environment is the key to ensure information security, including computer security operating system, various security protocols, security mechanisms (digital signature, message authentication, data encryption, etc. ), and even security systems, such as UniNAC and DLP. As long as there are security loopholes, global security may be threatened. Information security refers to the protection of information systems (including hardware, software, data, personnel, physical environment and its infrastructure) from being damaged, changed or leaked by accidents or malicious reasons, the system runs continuously and reliably, and the information service is uninterrupted, so as to finally realize business continuity.

Information security discipline can be divided into two levels: narrow security and broad security. Security in a narrow sense is the field of computer security based on cryptography, and the early information security major in China usually takes this as a benchmark, supplemented by computer technology, communication network technology and programming. Information security in a broad sense is a comprehensive subject. From traditional computer security to information security, it is not only a change of name, but also an extension of security development. Safety is a purely technical problem, but the product of the combination of management, technology, law and other issues. This major trains senior information security professionals who can engage in computer, communication, e-commerce, e-government and e-finance.