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With computer network computer is not the emergence of, but with the community to share resources and exchange information with the timely transmission of the urgent need to develop. It is the modern computer and communication technologies closely with the product. If the exact, Computer network is the use of communications equipment and communications lines to keep computers and other equipment interconnected, Use the software to share resources and information exchange system. Early network also refers only to a few units of computers together with a cable, achieving partial sharing of resources and exchange of information. Today's networks, the world's 100 countries, large and small, tens of millions of Taiwan computer as a single entity. WH formed spiderweb same as a "monster" in the world to achieve comprehensive resource sharing and information exchange. This is the Internet (Internet), also known as the Internet. For a flat, as long as you put the unit's external network connections to the Internet an passengers. your network from the fundamental nature of the change, have denotation and connotation of a fundamental change. We talked about today's networks, it refers to the Internet, "the Internet" is on the Internet. Network security is the security of computer information systems in an important aspect. As the opening of Pandora's Box, the computer systems of the Internet, greatly expanded information resources sharing space at the same time, will be exposed in their own malicious more under attack. How to ensure that network storage, security and the transmission of information security, is the so-called computer network security. Information security is to prevent information from the property have been deliberately or accidentally leaked authorized illegal, altered, damage or illegal information system identification, control; ensure confidentiality, integrity, availability, controllable. Information security, including operating system security, database security, network security, virus protection, access control, encryption and identification of seven areas. Design of a network security system, we must not only effectively prevent the system to a wide range of network attacks, guarantee the safety of the system, and also have a higher cost-effectiveness, operational simplicity, and transparent to the user interface and friendly.