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Showing 2 results for Block Ciphers
Dr. Hadi Soleimany, Mr. Mohammad Reaza Sadeghi,
Volume 7, Issue 1 (9-2018)
Abstract
Block cipher attacks have found new aspects, due to the advancement of the technology and the development of the software and hardware tools. In many cases, the attackers try to use the weaknesses of the block ciphers implementation, instead of the theoretical cryptanalyses. Increasing the attacker’s accessibility to the details of the block ciphers implementation will increase the chance of success of his attacks. Hence, it is important to design secure block cipher schemes, those are unbreakable whether the attackers have access to the details of the implementation or not. In this paper, first we will introduce the different models of the block ciphers implementation, then we will explain the fundamental concepts of the white-box cryptography, and why it is useful. Later we will discuss several white-box schemes.
Sara Zarei , Hadi Soleimany,
Volume 8, Issue 2 (2-2020)
Abstract
One of the usual ways to find sensitive data or secret parameters of cryptographic devices is to use their physical leakages. Power analysis is one of the attacks which lay in such a model. In comparison with other types of side-channels, power analysis is so efficient and has a high success rate. So it is important to provide a countermeasure against it. Different types of countermeasures use different methods and can be applied at different levels. Masking is an effective one which provides provable security in algorithm level. however even masked algorithms are sometimes suspected to leak kind of information in a condition that implemented in hardware leads to power analysis attacks. Threshold implementation is a way to secure hardware implementations against such probable challenges. In this paper, first we will introduce the different attack models in block ciphers, then we will concentrate on the gray-box model and explain the concepts of power analysis attacks and fundamentals of masking countermeasure. Later we will discuss the challenges of masking method in hardware implementations and introduce threshold implementation and its different aspects.
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