Network security is the network hardware， software and system data to be protected， not because of accidental or malicious reasons， suffered damage， alteration， disclosure， the system for normal operation and reliable， network services are not Network security is the essence of their network information In the broad sense， all related to the network of information confidentiality， integrity， availability， authenticity and controllability of the related technology and theory are the network security research Network security is the one involved in computer science， network technology， communications technology， cryptography， information security technology， applied mathematics， number theory， information theory， such as the integrated multi-disciplinary Network security as the specific meaning of "perspective" and For example: From the users (individuals， businesses， ) point of view， they want to involve the interests of personal privacy or commercial information transmission on the network by the confidentiality， integrity and authenticity protection， to avoid other people or against the use of wire-tapping， impersonation， tampering， repudiation， such as a means of violating the interests of users and Key words: Network security analysis， Network encryption， Information collection， Internet Firewall
