Reflection Cryptanalysis of GOST Block Cipher<br/>

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Reflection Cryptanalysis of GOST Block Cipher

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 46499 (02)
University: Sharif University of Technology
Department: Mathematical Sciences
Advisor(s): khazaei, Shahram
Abstract:
Block ciphers are the central tool in the design of security protocols. GOST is a block cipher that several attacks have been published on it during the past 20 years. One of them is the reflection attack that was first introduced in 2007. This attack utilizes similarities of some round functions of both encryption and decryption processes. In addition, there are approaches that combines techniques of the reflection attack and variants of the meet-in-the-middle attack. In this thesis, we study reflection-based attacks on GOST. We first describe the GOST block cipher and the reflection attack. Then, we review previous reflectionbased attacks such as reflection-meet-in-the-middle attack and mount them on GOST. Finally, we make a new attack on full GOST and give a comparison between some important published attacks on GOST. Nevertheless our new attack is not better than some of old ones
Keywords:
Block Cipher ; Security Protocols ; GOST Block Cipher ; Reflection Cryptanalysis ; Meet-in-the Middle Attack