3,570 research outputs found

    On The Cost of ASIC Hardware Crackers: A SHA-1 Case Study

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    International audienceIn February 2017, the SHA-1 hashing algorithm was practically broken using an identical-prefix collision attack implemented on a GPU cluster, and in January 2020 a chosen-prefix collision was first computed with practical implications on various security protocols. These advances opened the door for several research questions, such as the minimal cost to perform these attacks in practice. In particular, one may wonder what is the best technology for software/hardware cryptanalysis of such primitives. In this paper, we address some of these questions by studying the challenges and costs of building an ASIC cluster for performing attacks against a hash function. Our study takes into account different scenarios and includes two cryptanalytic strategies that can be used to find such collisions: a classical generic birthday search, and a state-of-the-art differential attack using neutral bits for SHA-1. We show that for generic attacks, GPU and ASIC poses a serious practical threat to primitives with security level ∼ 64 bits, with rented GPU a good solution for a one-off attack, and ASICs more efficient if the attack has to be run a few times. ASICs also pose a non-negligible security risk for primitives with 80-bit security. For differential attacks, GPUs (purchased or rented) are often a very cost-effective choice, but ASIC provides an alternative for organizations that can afford the initial cost and look for a compact, energy-efficient, reusable solution. In the case of SHA-1, we show that an ASIC cluster costing a few millions would be able to generate chosen-prefix collisions in a day or even in a minute. This extends the attack surface to TLS and SSH, for which the chosen-prefix collision would need to be generated very quickly

    Analysis and Design Security Primitives Based on Chaotic Systems for eCommerce

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    Security is considered the most important requirement for the success of electronic commerce, which is built based on the security of hash functions, encryption algorithms and pseudorandom number generators. Chaotic systems and security algorithms have similar properties including sensitivity to any change or changes in the initial parameters, unpredictability, deterministic nature and random-like behaviour. Several security algorithms based on chaotic systems have been proposed; unfortunately some of them were found to be insecure and/or slow. In view of this, designing new secure and fast security algorithms based on chaotic systems which guarantee integrity, authentication and confidentiality is essential for electronic commerce development. In this thesis, we comprehensively explore the analysis and design of security primitives based on chaotic systems for electronic commerce: hash functions, encryption algorithms and pseudorandom number generators. Novel hash functions, encryption algorithms and pseudorandom number generators based on chaotic systems for electronic commerce are proposed. The securities of the proposed algorithms are analyzed based on some well-know statistical tests in this filed. In addition, a new one-dimensional triangle-chaotic map (TCM) with perfect chaotic behaviour is presented. We have compared the proposed chaos-based hash functions, block cipher and pseudorandom number generator with well-know algorithms. The comparison results show that the proposed algorithms are better than some other existing algorithms. Several analyses and computer simulations are performed on the proposed algorithms to verify their characteristics, confirming that these proposed algorithms satisfy the characteristics and conditions of security algorithms. The proposed algorithms in this thesis are high-potential for adoption in e-commerce applications and protocols

    Security Applications of Formal Language Theory

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    We present an approach to improving the security of complex, composed systems based on formal language theory, and show how this approach leads to advances in input validation, security modeling, attack surface reduction, and ultimately, software design and programming methodology. We cite examples based on real-world security flaws in common protocols representing different classes of protocol complexity. We also introduce a formalization of an exploit development technique, the parse tree differential attack, made possible by our conception of the role of formal grammars in security. These insights make possible future advances in software auditing techniques applicable to static and dynamic binary analysis, fuzzing, and general reverse-engineering and exploit development. Our work provides a foundation for verifying critical implementation components with considerably less burden to developers than is offered by the current state of the art. It additionally offers a rich basis for further exploration in the areas of offensive analysis and, conversely, automated defense tools and techniques. This report is divided into two parts. In Part I we address the formalisms and their applications; in Part II we discuss the general implications and recommendations for protocol and software design that follow from our formal analysis
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