【作者】 方芳；

【导师】 杨文川；

【作者基本信息】 北京邮电大学 ， 计算机应用技术， 2010， 硕士

【摘要】 随着计算机及网络技术的迅猛发展,非法用户或黑客通过网络对信息系统的入侵也越来越多,系统安全保护已经成为刻不容缓的问题,进行用户身份认证是实现系统安全保护的一个重要手段。传统的系统登录方式为单一的口令认证,其缺点是口令容易被泄漏,带来安全隐患,因此提出了生物认证技术并成功地增强了系统的安全性。本篇论文的项目依托是城市管理舆情信息系统,它主要是针对城市规划和建设的舆情信息进行网络抓取然后进而分析数据,所以它需要处理的入库的数据是关于城市信息的相关数据,这些非常重要的信息以及统计分析的结果对于了解整个城市规划和发展的情况起到了十分重要的作用。除此之外,该系统需要对于不同的用户角色有不同的操作权限,因此对身份认证有着更严格的要求。针对本此项目的具体要求,本篇论文的工作量主要体现在：1.总结了各类个性化身份认证技术的原理,并详细比较了各自应用的优缺点。2.在分析了原先的击键认证算法的基础上,从个性化的角度提出了一个改进的击键认证算法,并提出了键纹认证技术这一概念。在深入研究算法的过程中,改进的认证算法不再是以击键的总体频率特征为出发点,而是以用户每一次的击键点为研究对象,细致全面得分析了用户的击键特征轮廓,这就像是用户的个性化键纹一样,能够对于认证系统的安全性起到很好的保护作用,所以键纹认证这个概念更能符合本篇认证系统核心算法的涵义。3.最后设计了不同角色的键纹认证环节流程,将键纹认证技术应用于城市管理舆情信息系统中,并从应用结果和实际数据分析可以得出：改进的键纹认证算法的错误警告率FAR与错误通过率IPR性能均要好于改进前的认证算法,因此本篇键纹认证技术在此舆情系统的安全保护方面起到了很好的作用,目前系统运行效果良好。更多还原

【Abstract】 Along with the technical development of computers and networks, unauthorized users or hackers do more and more invasions on the information system through the network. Therefore, protection of computer security has become a matter of urgency. User’s identity authentication is an important means to carry out system security. The traditional login method only depends on a single password content, which has the drawback of password leak and security problems, so biological identification technology is proposed to enhance system security by taking use of human biological characteristics.The background of this paper is the consensus information system, which is based on urban management data. This consensus information system is mainly aimed to the opinion of managing and planning the urban development, so the data addressed and stored in the database is about the city construction, and these information and the results of statistical analysis play a very significant role on the understanding of the overall situation of urban planning and development. Besides, this system needs the different user roles who have different operation privileges. Therefore, the identity authentication of users in this system have more strict rules.For the specific requirements of this project, the workload of the thesis is mainly reflected in:1.Summarize the various types of personalized identity authentication technology, and make detailed comparisons of their advantages and disadvantages about application.2.On the basis of summing up and absorbing the former authentication algorithm of the keystrokes, an improved keystroke authentication algorithm has been proposed from a personal point of view, and then lead to the concept of keystroke print authentication technology. In the process of studying the algorithms, the improved authentication algorithm no longer considers the overall keystroke frequency, but the every keystroke spot, which can do a detailed and comprehensive analysis of the user’s keystrokes characteristic profile, which just like the user’s personalized keystroke print and can play a very good protective effect of the authentication system, so the concept of keystroke print authentication is more in accordance with the meaning of the core algorithm in the authentication system.3.Lastly, design the different identification process of keystroke print to the different system roles, and apply this improved authentication algorithm of keystroke print to the identity authentication part of the consensus information system aimed for the urban data analysis. From the results of application and the actual data analysis can be drawn that both the FAR (false alarm rate) and the IPR (Imposter pass rate) of the improved keystroke print authentication algorithm are better than the performance of former authentication algorithm, so the keystroke print authentication technology has played an important role in the security protection of consensus information system, and the system is running well.更多还原