The so-called information security is to ensure the confidentiality, authenticity, integrity, unauthorized copy and the security of the parasitic system of information. Information security itself includes a wide range, including how to prevent the leakage of business secrets, prevent teenagers from browsing bad information, personal information leakage, etc. The information security system under the network environment is the key to ensure the information security, including the computer security operating system, various security protocols, security mechanisms (digital signature, message authentication, data encryption, etc.), and even the security system, such as uninac, DLP, etc., as long as there is a security leak, it can threaten the overall security. Information security refers to the protection of information system (including hardware, software, data, human, physical environment and its infrastructure) from damage, change and leakage due to accidental or malicious reasons, continuous and reliable operation of the system, uninterrupted information service, and ultimately business continuity.