3 research outputs found

    [[alternative]]Computing and Crypto Applications of Discrete Algebraic Structures

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    計畫編號:NSC93-2115-M032-008研究期間:200408~200507研究經費:398,000[[sponsorship]]行政院國家科學委員

    Enhanced STS using Check Equation --Extended Version of the Signature scheme proposed in the PQCrypt2010--

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    We propose solutions to the problems which has been left in the Enhanced STS, which was proposed in the PQCrypto 2010. Enhanced STS signature scheme is dened as the public key with the Complementary STS structure, in which two STS public keys are symmetrically joined together. Or, the complementary STS is the public key where simply two STS public keys are joined together, without the protection with Check Equation. We discuss the following issues left in the Enhanced STS, which was prosented in the PQCrypt2010: (i) We implied that there may exist a way to cryptanalyze the Complementary STS structure. Although it has been proposed that the system be protected by Check Equations [35][37], in order to cope with an unknown attack, we did not show the concrete procedure. We show the actual procedure to cryptanalyze it and forge a signature. (ii) We assumed that the Check Equation should be changed every time a document is signed. This practice is not always allowed. We improved this matter. The Check Equation which was proposed in the PQCrypto 2010 dened the valid life as a function of the number of times the documents are signed, because the secret key of Check Equation is analyzed by collecting valid signatures. Now we propose a new method of integrating the Check Equation into the secret key and eliminate the risk of the hidden information drawn from the existing signature

    Preparation for Post-Quantum era: a survey about blockchain schemes from a post-quantum perspective

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    Blockchain is a type of Distributed Ledger Technology (DLT) that has been included in various types of fields due to its numerous benefits: transparency, efficiency, reduced costs, decentralization, and distributivity realized through public-key cryptography and hash functions. At the same time, the increased progress of quantum computers and quantum-based algorithms threatens the security of the classical cryptographic algorithms, in consequence, it represents a risk for the Blockchain technology itself. This paper briefly presents the most relevant algorithms and procedures that have contributed to the progress of quantum computing and the categories of post-quantum cryptosystems. We also included a description of the current quantum capabilities because their evolution directly influences the necessity of increasing post-quantum research. Further, the paper continues as a guide to understanding the fundamentals of blockchain technology, and the primitives that are currently used to ensure security. We provide an analysis of the most important cryptocurrencies according to their ranking by market capitalization (MC) in the context of quantum threats, and we end up with a review of post-quantum blockchain (PQB) schemes proposals
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