Journal of Computer Applications

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Improvement and security analysis on MD5

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  • Received:2008-10-06 Revised:2008-11-26 Online:2009-04-01 Published:2009-04-01
  • Contact: Shao-lan ZHANG

对MD5的改进及其安全性分析

张绍兰 邢国波 杨义先   

  1. 山东建筑大学
  • 通讯作者: 张绍兰

Abstract: The method of differential analysis on collision attacks against MD5 was analyzed. Considering the increase of message blocks to be hashed via message pre-processing, a new method of modifying the step function of MD5 was proposed. The method can raise the resistibility of collision attack by preventing choosing a good differential path and limiting the use of message modification techniques. The efficiency of the improved algorithm is higher than that of method via message pre-processing.

Key words: Hash function, MD5, collision attack, differential analysis, message modification

摘要: 针对MD5的碰撞攻击,分析了差分分析的步骤和方法;针对消息预处理导致了分组块数增加这一缺陷,提出了修改步函数的方法,能阻止选择好的差分路径,限制消息修改技术的使用,增强了抗碰撞攻击的能力。实验结果表明改进后算法的效率比消息预处理方案的效率高。

关键词: Hash函数, MD5, 碰撞攻击, 差分分析, 消息修改

CLC Number: