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21世纪全世界的计算机都通过Internet联到一起,信息安全的内涵也就发生了根本的变化,它从一般性的防卫变成了一种非常普遍的防范。如何保证网络的安全运行,已成为网络用户非常关心的问题。
In the 21st century, computers all over the world are linked together through the Internet. The connotation of information security has also undergone fundamental changes. It has become a very common precaution from the general defense. How to ensure the safe operation of the network has become a very concern for network users.