2918.a密钥分散管理系统——密钥确认算法实现 毕业设计论文.doc

大学 毕 业 设 计（论 文） 题 目：密钥分散管理系统—— 密钥确认算法实现 专 业： 信息安全 学生姓名： 班级学号： 指导教师： 指导单位：计算机学院硬件基础教学中心 源代码联系本人 日期： 2009年3月12日至 2009年6月15日 摘 要 随着人类社会进入信息时代，信息的产生、处理及安全保密已成为大家都关心的事情。为了实现信息的安全保密，人们可以采用密钥加密信息，从而使不拥有秘密钥的非法人员无法窃获信息。这使得信息的安全保密主要维系于秘密钥的安全，而不是对加密算法的保密。所以保证秘密钥的安全及如何有效地管理密钥成了密码学中十分重要的课题。 本论文主要介绍了多用户口分散管理系统的口令确认算法及界面。能够迅速、准确地对个用户中的任意个或个以上合法用户的口令进行确认，并对用户码和上机时间等有关信息进行记录，可在一定时间内屏蔽连续多次口令输入错误的合法用户，对非法用户的恶意攻击具有较强的抗攻击能力，所编软件应具有通用性。界面设计合理、友好，具有检错和出错提示功能，界面同时应能适应系统内部参数的变化，保持相对稳定性。将密钥sS分成n个子密钥vi V，1 i ≤ n。它们满足已知任意不少于 (1 ≤ k ≤ n)个子密钥 vi可容易恢复密钥 s ；若仅知任意不多于 - 1 个子密钥vi ，则关于密钥 s 就完全不能确定。称这种方案为( k , n)门限方案。As human society entered the information age, information generation, processing and security has become a matter of interest to everyone. In order to achieve the security and confidentiality of information, people can encrypt information with key, so that people who don’t possess the secret key can not steal illegal personnel information. This makes the security and confidentiality of information mainly depending on the security of secret keys, rather than the secrecy of the encryption algorithm. Therefore, ensuring the safety of the secret key and how to effectively manage key has become a very important issue in cryptography. This paper mainly introduces the confirmation algorithm and interface of a decentralized multi-user password management system. The program can quickly and accurately confirm any k or more than k of n legitimate user's password. And record the user code and the time. It can shield the legitimate users who input the wrong password many times within a certain period of time. It can strongly counteract malicious attacks of illegal users. The software should be universal. The interface designing should be reasonable and friendly. It should be with prompt error and error functions. The interface should be able to adapt to changes of system parameters and