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The Differential Attack of Serpen

Author: LiuYa
Tutor: ZhouDaShui
School: Shandong University
Course: System Analysis and Integration
Keywords: Differential analysis Block cipher Cryptography AES SPN
CLC: TN918.1
Type: Master's thesis
Year: 2010
Downloads: 76
Quote: 1
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Abstract


With the development of the information age, information security has become important to be problems of this era. Cryptography as a key technology for security and information security, subject to the attention of the world. 1949 Shannon published paper \Comprehensive discussion of confidentiality issues with the point of view of information theory, proved only a \1976, Diffie, Hellman seminal paper published in \As technology advances, even the enhanced version of DES 3DES security can not meet the requirements of the practice, so the NIST (National Institute of Standards and Technology) in 1997, the collection activities of the Advanced Encryption Standard (AES) [20]. This open solicitation activity off the the block ciphers research climax. The event collected the 15 algorithms, which reflects the highest level of the block cipher today. Serpent [19] is a world-renowned cryptographer Ross J. Anderson, Eli Biham, Lars R. Knudsen collection activities submitted to the NIST AES algorithm. Final Rijndael [21] obtained the victory, Serpent ranked second. Serpent design largely reflects today's block cipher design techniques and experience, it uses the classic SPN password structure, open S-box design, Serpent analysis not only helps us to understand the security of this algorithm and also help us to analyze and design other block cipher. Differential analysis [5] E. Biham and A.Shamir found in the analysis of the process of DES soon differential analysis is widely used in the analysis of block cipher and hash function. Differential analysis of the relationship between a differential explore the differential input plaintext on probability and output ciphertext pair to try to crack the cryptosystem. Now, differential analysis and linear analysis [22] is the most important method of analysis of block ciphers and the Hash function. This paper first introduces the modern network information security and cryptography overview, and then about the principle of differential analysis and sample differential analysis of how to attack SPN block cipher. After introduction Serpent algorithm, the article uses the differential analysis methods to analyze the Serpent and the show to get three good five differential path, its probability of 1 / (2 67 ) 1 / (2 65 ) and 1 / (2 63 ). The first two are differential x 28 = 4 after S 3 28 = 10 transform transform differential x based, and then forward to reverse round function computing development. Results a differential path probability is 1 / (2 63 ), which is based on x 28 = 10 after S 4 transform differential x 28 = 2, then forward, reverse round function computing development to. For further analysis for Serpent has great reference value.

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