Using AT89C52 to Design Disorder Keyboard

针对传统密码键盘的安全性差的缺点，在传统密码键盘的基础上，设计了一种乱序密码输入键盘，增加了新的功能和特性．一方面在键盘数字按键上增加了数码管来显示0至9十个数字，且设计了随机数产生软件实现了随机变位，另一方面在按键上面贴一层特殊的透光材料。使视线具有一定的视角限制，在一定角度之外的人不能看到键盘上的数字。即使他人看到用户所按的键位，由于密码输入完毕后，键位又会重新打乱顺序，因此用户可以安全放心地在键盘前输入密码，不必担心别人通过拍摄或观察人的手型等方法来获取密码，从而大大提高了密码输入的安全性，杜绝了金融领域相关的犯罪现象。

Using AT89C52 to Design Disorder Keyboard

The password keyboard as a kind of input device that is essential to bank and other financial departments, it must have high credibility, safety, and the function of keeping secret. Disorder keyboard is a developed kind on the basis of the traditional password keyboard, which increased some new functions and characteristics, for example, there is LED on the surface of the keys, and the numbers displayed on the keys are random, also a certain angle of view is restricted. Outside of a certain angle, the number LED displayed on the keyboard is impossible to be seen. Even other people can see the keys that the customer pressed, but because when the customer finished inputting the password, the key numbers will be re-arranged again, so, the customer unnecessarily worried about that other people would take his password.