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MD5 and partial new Hash function analysis of

Author: LiXiuZhen
Tutor: ZhangWenYing
School: Shandong Normal University
Course: Computer Software and Theory
Keywords: MD5 Collision Differential path Gr (?) Stl function SHA-3
CLC: TN918.1
Type: Master's thesis
Year: 2011
Downloads: 98
Quote: 0
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Abstract


With the development of modern computer networks and e-commerce, the user is getting higher and higher security requirements of information in the interactive process. Because the information may be subject to a form of tampering, posing and repudiation of threats and attacks during transmission. This relates to the integrity and authenticity of the information. To address these issues, to ensure the integrity of the information, entity authentication and repudiation, major technology information to identify Hash function. Hash functions, also known as a hash function or hash function, mainly used for digital signature and file checksum. Hash function, the most widely used MD5. MD5 function is one-way function algorithm developed by the Massachusetts Institute of Technology professor Ron Rivest in 1991, it is on the basis of the MD4 function evolved. MD5 input a message of arbitrary length, the output is a 128-bit message digest, and 512-bit input data block as a unit for processing. 2004 Professor Wang Xiaoyun successful break the MD5 functions, boom set off password sector to study the function. In 2008, Dr. Xie Tao designed two collision path, and the path to find a collision message pair. This shows that MD5 is no longer secure, you need a new Hash function. So NIST (National Institute of Standards and Technology, the U.S. National Institute of Standards Technology Institute) Call for SHA-3 standard function worldwide has now proceed to the final step of the five function screening Blake, Gr? Stl , JH, Keccak and Skein. Where Gr? The stl function design and AES are very similar, previous studies AES method can be applied to the study Gr? Stl function. In order to make its own contribution to keep up with the world of cryptography research and development trend of China's information security career, do the following work: (1) Through the study of Wang et al attack MD5 differential analysis methods and research Dr. Xie Tao 1 bit collision differential paths to find a 1-bit differential collision path, and given the the link variables need to meet the full. (2) According to Professor Wang Xiaoyun, multi-message modification method, the method of the Tunnel ideological and Weiweijiuzhao \(3) through the \(4) learning rebound attack, Gr? Stl function five, six, seven, analysis, and given a new path of attack, eight differential path. While these attacks are theoretical, but after we study the function of other similar structures will be of great help.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Confidentiality of communications and communications security > Theory
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