基于迭代置换的MD5改进算法  

Research of Improved MD5 Algorithm Based on Iterative Permutation

作　　者：曾凌静[1] 黄金凤[1] ZENG Ling-jing;HUANG Jin-fen(Department of Information Engineering, Fujian Chuanzheng Communications College,Fuzhou 350004, China)

机构地区：[1]福建船政交通职业学院信息工程系,福建福州350004

出　　处：《三明学院学报》2017年第6期18-24,共7页Journal of Sanming University

摘　　要：针对目前网络安全中,数据加密技术存在加密强度、运算量大等缺陷,提出了一种基于迭代置换的MD5改进算法。首先将MD5以512位的分组来处理输入的信息,然后每一分组又被划分成为16个32位的子分组,经过了填充、加长、分块、迭代、置换5个步骤,输出由8个64位的分组,最后将这8个64位的分组结合后映射生成一个256位散列值。改进后的MD5算法与已有的算法对比,更加有效地保证了用户的密码安全。In view of the shortcomings of network security,such as high encryption strength and large computational complexity,an improved M D5algorithm based on iterative permutation is proposed.F irstly,M D5algorithm is used to process the input information by512-bit packets.T hen each packet is divided into sixteen32-bit subpackets.A fter five steps such as filling,extension,block,initialize variables and processing,the output is composed of eight64-bit packets.Finally,a256hash value is generated by combining the eight64-bit packets.Compared with the existing algorithms,the improved MD5algorithm protects users'passw ord security more effectively.

关 键 词：MD5算法 单向散列函数 迭代置换 密码 安全 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]