基于89C51的随机防盗键盘设计(论文形式),包含该防盗键盘的原理,各模块原理与设计思路,源代码,电路图,已经成品照片.-89C51-based keyboard design random security (paper form), the keyboard contains the security principle, the principle and design ideas of the modules, source code, schematics, has been fini