The traditional model usually uses user name and password for identity authentication so as to guarantee the security of system.The model runs in synchronization mode and low efficiency,it stores information according to text format.To improve the safety of the system,the paper combines Ajax asynchronous mode,the features as bitmap to store information and permission of access control to realize with high efficiency the Web system identity authentication function.The article gives a example to explain the process of implementation in detail.%为了保证Web系统的安全,传统的模式一般采用用户名和密码来进行身份认证,这种模式以同步方式运行,以文本格式存储,效率低,安全性差,Ajax技术的异步能力、图形验证码的点阵存储、权限访问控制三者相结合,高效实现了Web系统身份认证功能,安全性能大有改善。
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