在我们自己的应用程序中，可以考虑在发生认证失败的情况时清除用户名和密码，并向屏幕上添加一条错误消息。
In your own applications, you might consider clearing the username and password when failure occurs because of authentication and adding an error message to the screen.
分组密码广泛应用于各类密码算法，如加密算法和消息认证码(MAC)。
Block ciphers can be used in many cryptographic primitives, such as encryption and message authentication code (MAC).
在方案中仅仅使用了视觉密码和消息认证码两个密码组件，在不降低安全性的前提下，有效地避开了传统密码的缺点。
It avoided the disadvantages of traditional cryptography by adopting only two cryptography components: visual cryptography and MAC, and the safety has not been lowered down.
在方案中仅仅使用了视觉密码和消息认证码两个密码组件，在不降低安全性的前提下，有效地避开了传统密码的缺点。
It avoided the disadvantages of traditional cryptography by adopting only two cryptography components: visual cryptography and MAC, and the safety has not been lowered down.
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