文件加密解密算法研究和实现——基于USBKEY的文件加密解密方案.pdf

上海交通大学工程硕士学位论文摘要第 5 页文件加密解密算法研究与实现——基于USBKEY的文件加密解密方案摘 要随着信息社会的到来,人们在享受信息资源所带来的巨大便利的同时,也面临着信息安全问题的严峻考验。如何实现对企业重要信息的加密,防止企业机密信息的泄漏,提高内部机要文件存放的安全性,是当前信息安全领域的一个重要课题。本文的主要研究内容是文件加密系统的解决方案中文件的加密算法和密钥管理。首先,论文对现有四种加密方式进行了深入研究,详细分析了这四种加密方式在使用技术、密钥管理及安全强度方面的优缺点及其具体适用环境。对现有文件加密系统方案的合理性进行了评估、分析和比较。其次,本文提出了一种安全有效的文件加密方案,其中主要工作有两大部分:,加密强度不高进行了改进,并基于混合型加密原理作为本文提出文件加密方案的主要手段。与改进前相比,新方案在文件加密强度上有了较大的提高,消除了原加密体制存在的诸多安全威胁。,将密钥管理和密码钥匙盘(USBKEY)相结合,在抗模拟接口、抗跟踪软件能力上有很大的提高,将密钥和密文彻底分离,大大提高了密钥的安全性。最后本文对所提出的加密系统的内存加密数据速度以及文件加密速度进行了测试。分别将一个文件631KB 和3MB 的文件进行了加解密的测试,测试结果表明本文提出的文件加密系统具有较好的性能,具有较大的实用性。关键词:密码体制;DES;RSA;USB;加密; 上海交通大学工程硕士学位论文摘要第 6 页ABSTRACT With the advent of the information society, people enjoying the tremendous information resources to facilitate the same time, also faces a severe test of information security issues. How to achieve business critical information on encryption, to prevent enterprises from the leakage of confidential information to improve the security of internal confidential document repository, and is the current information security is an important issue. The main research contents of this file encryption system, the solution file encryption algorithm and key management. First, the papers on the existing four kinds of encryption methods conducted in-depth research, detailed analysis of these four kinds of encryption methods in the use of technology, key management and security strength of the strengths and weaknesses and their practical application in the environment. On the existing file encryption system, the rationality of the program were assessed, analysis parison. Secondly, this paper presents a safe and effective file encryption program, which has two main parts: 1. For the original use of a single encryption algorithm, encryption is not high intensity has been improved, and is based on principles of hybrid encryption file encryption program, as proposed in this paper the principal means. And pared to before the new package fil