论文部分内容阅读
互联网的安全是一个不能忽视的问题。人们在享受互联网带来的方便与快捷的同时,也要面对互联网开放带来的数据安全方面的新挑战和新危险。 为了保障安全,当用户与互联网连接时,可以在中间加入一个或多个中介系统,防止非法入侵者通过网络进行攻击,并提供数据可靠性、完整性方面安全和审查控制,这些中间系统就是防火墙(Firewall)。它通过监测、限制、修改跨越防火墙的数据流,尽可能地对外屏蔽网络内部的结构、信息和运行情况,以此来实现内部网络的安全保护。
Internet security is a problem that can not be ignored. While enjoying the convenience and speed brought by the Internet, people also have to face the new challenges and dangers in data security brought about by the opening up of the Internet. For security purposes, when users connect to the Internet, they can join one or more intermediary systems in the middle to prevent unauthorized intruders from attacking over the network and provide data reliability, integrity and security controls and censorship control. These intermediate systems are firewalls (Firewall). It protects the internal network by monitoring, limiting and modifying the data flow across the firewall, shielding the internal structure, information and operation of the network as much as possible.