计算机网络安全是指利用网络控制和技术措施,保证在一个网络里,数据的保密性、完整性及可使用性受到保护。从技术上来说,计算机网络安全主要由防火墙技术等安全组件组成,一个单独的组件无法确保网络信息的安全性。目前广泛运用和比较成熟的网络安全技术主要有:防火墙技术、数据加密技术、PKI技术等。 Computer network security is the use of network control and technical measures to ensure that in a network, data confidentiality, integrity and usability is protected. Technically speaking, computer network security is mainly composed of security components such as firewall technology. A single component can not ensure the security of network information. Currently widely used and more mature network security technologies are: firewall technology, data encryption technology, PKI technology.