防止多次试探密码的密码锁设计-毕业论文(word格式).doc

编号: 本科毕业设计防止多次试探密码的密码锁设计院系:信息工程学院姓名:田园学号: ********** 专业:通信工程年级: **级指导教师: *** 职称:讲师完成日期: 2012 年5月 I 摘要伴随着科技的进步和人们生活水平的提高,人们的安全防范意识逐步提升,如何实现防盗这一问题也变的尤为突出,传统机械锁由于制作工艺简单,近些年来被撬事件屡见不鲜;电子锁由于其保密性高,使用灵活性好,安全系数高,价格低廉等特点,受到了广大用户的青睐。本设计采用单片机 AT89C51 作为密码锁监控装置的检测和控制核心,实现钥匙信息在主机上的初步认证注册、输入密码错误次数过多报警、钥匙丢失报废等功能。根据 51单片机之间的串行通信原理,这便于对密码信息的随机加密和保护,键盘输入密码更提高了密码的安全性。采用数字信号编码和二次调制方式,不仅可以实现多路信息的控制,提高信号传输的抗干扰性,减少错误动作,而且有功耗较低、反应速度快、传输效率高、工作稳定可靠等。软件设计采用自上而下的模块化设计思想,以使系统朝着分布式、小型化方向发展,增强系统的可扩展性和运行的稳定性。经过在开发板上面的测试,已经达到了应有的效果,本系统已经完成本设计的所有要求。关键词:单片机;掉电存储;设计;密码锁 II Abstract With the development of science and the improvement of people ’s living standard, people ’s saftety guard consciousness guadually improve s, and the problem ofhow to carry out the family to guard against theft has e particularly outstanding. Because of the simple construct of traditional machine lock, the affairs of theft is hackneyed. The electronic lock is safer because of its confidentiality, using the vivid good , the safe coefficient is high and low prices, being the majority of users pro-gaze. This design uses the single-chip puter AT89C51 bination lock monitoring device of the detection and control core . It can carry out the key information to register in the main on board initial attestation, the password information encrypt etc. Go to correspond by letter the principle according to the string between 51 machines, this is easy to encrypt and protect to the passwords information random. Adopt ing the numerical signal codes not only can carry out many controls of the road information, raise the anti- interference that signal deliver, reduce the mistake action, but also the power consume is low ,and it can r espond quickly, the efficiency deliver is high, the work is stable and reliable, etc. The software design uses the design thought of from top to bottom, which can make the system toward s wear distribute type, turn to the direction development of small, strengthen the system and it can enhance the system extensibil