Implementing confidential transactions with lattice techniques

Zhang, Huang; Zhang, Fangguo; Wei, Baodian; Du, Yusong

doi:10.1049/iet-ifs.2018.5491

Cited by 6 publications

(9 citation statements)

References 33 publications

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“…Our confidential transactions also suffer from this limitation on the number of inputs and outputs. However, similar to [21], having binary commitments is more efficient than having large modulus like [25]. Moreover, our protocols are aggregable due to the static carries, unlike MatRiCT with volatile carries, which do not remove additional transactions' inputs.…”

Section: Related Workmentioning

confidence: 83%

“…a short vector, when the norm is γ and modulus is q γ. For example, [25]'s shortnorm vectors are [v, r 1 , r 2 ..] for some coin amount v and masking key [r 1 , r 2 ..]. However, such quantum-safe 4 latticebased CTs as [25] are not efficient and have limitations on the commitments that can be added.…”

Section: Introductionmentioning

confidence: 99%

“…For example, [25]'s shortnorm vectors are [v, r 1 , r 2 ..] for some coin amount v and masking key [r 1 , r 2 ..]. However, such quantum-safe 4 latticebased CTs as [25] are not efficient and have limitations on the commitments that can be added. For example, [25] works with lattice modulus q 2 64 • 10 6 for coin values in [0, 2 64 ) and maximum 10 6 unspent coin bundles.…”

Section: Introductionmentioning

confidence: 99%

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Aggregable Confidential Transactions for Efficient Quantum-Safe Cryptocurrencies

2022

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Confidential Transactions (CT) hide coin amounts even from verifiers without the help of trusted third parties. Aggregable CTs are a scalable category of CTs with "spent coin record trimming". For example, if Alice sends coins to Bob, and Bob sends those coins to Charles, the aggregated transaction shows that Alice sent coins to Charles by deleting Bob's coin records. Since the number of spent coin records grows linearly with the number of transactions, cash systems based on aggregable CTs are highly scalable. However, existing quantum-safe aggregable CT protocols have large unspent coin records, and existing efficient aggregable CTs are vulnerable to quantum adversaries. We introduce two aggregable CT protocols based on the Short Integer Solution (SIS) problem and the Module Short Integer Solution (MSIS) problem that are believed to be secure against quantum adversaries. Also, we implement a C library for the MSIS-based aggregable CT protocol. Our experiment on 10 4 transactions shows that aggregation reduces 40%-54% of the cash system's size when the output/input rate is in 1-2. For example, a cash system of 1.73 GB can be reduced to 0.98 GB when the output/input rate is 1.5, which is the real-world average output/input rate according to statistics.

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Section: Related Workmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Aggregable Confidential Transactions for Efficient Quantum-Safe Cryptocurrencies

2022

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“…For instance, the confidential transactions technique discussed in [45] can be adopted where the buyer and seller have contracts that contain price and other confidential information. The technique of confidential transactions is to keep the price amount secret and to grant verifiers the ability to check the validity of amounts [46]. In this case, buyer and seller perform a two-stage encryption process.…”

Section: Table I Price Adjustment and Execution Algorithmmentioning

confidence: 99%

A Blockchain-Enabled Decentralized Energy Trading Mechanism for Islanded Networked Microgrids

2020

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“…A public distributed transaction ledger records all new committed transactions in blocks, with every new committed transaction appended to the previous block. Hash functions generate a user address or shorten the size of the public address using SHA-256 and Scrypt algorithms to prevent forging [5]. Every transaction among the blocks bears a timestamp, and a hash value links them all in chronological order.…”

Section: Introductionmentioning

confidence: 99%

Promises and Perils of Post-Quantum Blockchain

Sheoran

Yadav

2023

Preprint

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In recent years, blockchain technology has emerged as a powerful solution to address various concerns related to data transfer over distributed networks, such as privacy, transparency, redundancy, and accountability. Its ability to offer decentralized trust, secure data usage, and efficient functioning has led to its successful implementation in critical areas like finance, e-governance, defense, academia, research, reputation systems, and smart manufacturing. Blockchain is a unique type of distributed ledger that relies on hash functions and public-key cryptography to store information in blocks protected by hash signatures, which are resistant to security breaches. However, the emergence of quantum computing and its ability to solve knapsack problems in real-time through Grover’s and Shor’s algorithms has raised concerns about the future of classical key cryptography. It is feared that post-quantum computers may be able to modify the hash signature and compromise the blockchain security. To address this issue, there is an urgent need to develop a blockchain cryptosystem that is resilient towards potential eavesdropping in the post-quantum age. This paper aims to explore the possibilities of developing such a futuristic post-quantum information security system while examining the promises and perils of blockchain technology. The study includes a comparative analysis of public-key post-quantum cryptosystems and signing algorithms to formulate future research directions in this field.

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Implementing confidential transactions with lattice techniques

Cited by 6 publications

References 33 publications

Aggregable Confidential Transactions for Efficient Quantum-Safe Cryptocurrencies

Aggregable Confidential Transactions for Efficient Quantum-Safe Cryptocurrencies

A Blockchain-Enabled Decentralized Energy Trading Mechanism for Islanded Networked Microgrids

Promises and Perils of Post-Quantum Blockchain

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