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Security Analysis and Design of the Hash Functions

Author: WeiYueChuan
Tutor: LiChao
School: National University of Defense Science and Technology
Course: Mathematics
Keywords: Hash functions Mode differential XOR difference Compression function Collision Attack Part of the collision
CLC: TN918.1
Type: Master's thesis
Year: 2007
Downloads: 180
Quote: 3
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Abstract


Hash function is an important branch of the field of cryptography , have a wide range of applications in the field of digital signatures, message authentication , integrity testing . In recent years, the Hash function cryptanalysis has been made a breakthrough in the design, analysis, evaluation Hash function has become a hot topic of the field of cryptography . Hash function design major iteration structure and compression function rd iteration structure and its defects This paper reviews the the Hash function basic design principles and common methods of attack , the most classic structure Merkle - Damg ( ? ) vulnerability on this basis , the study of three typical Hash function variant attacks , and to discuss the relationship between mode differential XOR differential , the main results of the study are as follows : Chabaud - Joux attacker is the most successful Hash Function SHA series attack , one of it is based on searching for the register difference correction style we give the form of the three variants of the SHA-256 compression function , analyzing the ability of a variant of the SHA-256 resistance Chabaud-Joux attack , and SHA-256 attacks the results were compared , and then analyzes the pros and cons of the SHA-256 compression function selection . SMASH is a new Hash function , introduced the the SMASH algorithm design and method of attack , the algorithm immune to this attack , to discuss the main idea of improving SMASH program , improved destruction before pushing nature and increase looking forward nature predictable differential of the complexity of the modular arithmetic and XOR is Hash function compression function used two operations , the difference is divided into mold differential XOR differential mode differential XOR differential given into each other full conditions necessary to obtain a pair of integers algorithm , seeking to maintain the mold differential unchanged under the conditions given exclusive or differential ; discussed the mode difference , exclusive or differential in the Hash function security analysis , as an example , the given specific methods for the searching for the message authentication code (MAC) function of ASP pseudo - collision .

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