Quisquis: A New Design for Anonymous Cryptocurrencies

Fauzi, Prastudy; Meiklejohn, Sarah; Mercer, Rebekah; Orlandi, Claudio

doi:10.1007/978-3-030-34578-5_23

Cited by 68 publications

(34 citation statements)

References 32 publications

(43 reference statements)

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“…QuisQuis [22] and Zether [5] propose solutions that provide partial anonymity. On a high level, instead of sending a transaction that refers only to the accounts of the sender and the recipients of a payment, the sender adds accounts of other users, who act as an anonymity set (similar to CryptoNote [44]).…”

Section: Related Workmentioning

confidence: 99%

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Privacy-preserving auditable token payments in a permissioned blockchain system

Camenisch¹,

Dubovitskaya³

et al. 2020

Proceedings of the 2nd ACM Conference on Advances in Financial Technologies

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Token payment systems were the first application of blockchain technology and are still the most widely used one. Early implementations of such systems, like Bitcoin or Ethereum, provide virtually no privacy beyond basic pseudonymity: all transactions are written in plain to the blockchain, which makes them linkable and traceable. Several more recent blockchain systems, such as Monero or Zerocash, implement improved levels of privacy. Most of these systems target the permissionless setting, and as such are not suited for enterprise networks. These require token systems to be permissioned and to bind tokens to user identities instead of pseudonymous addresses. They also require auditing functionalities in order to satisfy regulations such as AML/KYC. We present a privacy-preserving token management system for permissioned blockchains that also supports fine-grained auditing. The scheme is secure under computational assumptions in bilinear groups, in the random-oracle model. We provide performance measurements for our prototype built on top of Hyperledger Fabric.

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Section: Related Workmentioning

confidence: 99%

“…We call a decentralized token system privacypreserving if it partially or fully hides the transfer details. Examples of decentralized and privacy-preserving token systems are Confidential Assets [40], Zether [5], QuisQuis [22] and Zerocash [4], with the latter offering the highest level of privacy protection. Zerocash.…”

Section: Privacy-preserving Token Systemsmentioning

confidence: 99%

Privacy-preserving auditable token payments in a permissioned blockchain system

Camenisch¹,

Dubovitskaya³

et al. 2020

Proceedings of the 2nd ACM Conference on Advances in Financial Technologies

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“…Beyond papers found via our search method, we have included 2 relevant papers ( [11], [12]) based on presentations at the conference Theory and Practice of Blockchains 2019 at Aarhus University.…”

Section: ) Manual Additionsmentioning

confidence: 99%

“…By using ZK-SNArKs, Zerocash can prove that the sources of a new transaction are within the set of existing coins but have not been spent before, without disclosing the sources themselves. This means that Zerocash, similar to Monero, keeps an ever-expanding set of ''coins'' and ''spent coins'' [11]. In practice, the Zerocash implementation Zcash, uses multiple sets of coins, a transparent set as in the Bitcoin system, and a shielded-pool where transactions employ ZK-SNArKs to prove validity while hiding the specifics.…”

Section: ) Zerocashmentioning

confidence: 99%

“…Building on [36], Ruffing et al employ the idea of mixnets, 11 to implement Coinshuffle to address network resistence and performance [37]. However, as noted in [77], Coinshuffle is vulnerable to DoS-and Sybil attacks and does not support confidential transactions, thereby forcing users to find participants with identical mixing values, limiting thus the anonymity set.…”

Section: Approaches For Minimizing P2p Network Based Attacksmentioning

confidence: 99%

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Privacy and Cryptocurrencies—A Systematic Literature Review

2020

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Our transaction history in the current centralized banking system has the ability to reveal a lot of private information for each spender, both to the banking system itself, but also to those entities that surround it (e.g., governments, industry etc). Examples of leaking information constitute the amounts spent, the goods on which the amounts were spent, the spending locations and the users we exchange money with. This knowledge is powerful in the hands of those who have it, and can be used in multiple ways, not always to our benefit. Cryptocurrencies, such as the famous Bitcoin, were proposed as a means to address the limitations of centralized banking systems and to offer its users privacy with regards to their transactional data. In this work, we perform a systematic literature review on the realm of privacy for electronic currencies. We present the development of digital money from electronic cash to cryptocurrencies and focus on the techniques that are employed to enhance user-privacy. Furthermore, we present flaws of the current cryptocurrency systems, which reduce the privacy of the cryptocurrency users. Finally, we describe three research directions to enhance privacy for cryptocurrencies: transaction propagation mechanisms, succinct ZK proof systems without a trusted setup, and specialised trustless zero-knowledge proofs. INDEX TERMS Anonymity, bitcoin, confidentiality, cryptocurrencies, electronic cash, privacy, zero-knowledge.

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BPRT: A blockchain‐based privacy‐preserving transaction scheme based on an efficient broadcast encryption with personalized messages

Yao

Zhang

2022

Trans Emerging Tel Tech

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As blockchain has drawn more and more attention, much research has developed different transaction schemes with privacy preserving specialized in various fields. The nature of blockchain makes the transaction information public, which presents much risk about the leakage of user privacy. It is quite necessary to design a flexible scheme to provide privacy preserving of transaction contents with reliable audit in blockchain that is lacked in the previous works. In this paper, we propose a blockchain‐based privacy‐preserving transaction scheme based on an efficient broadcast encryption with personalized messages called BPRT. First, we propose a fully anonymous broadcast encryption with personalized messages (BEPM). Compared with existing works, it is fully anonymous, and it has lower computation cost without pairing operations. It also avoids the key escrow problem existing in other BEPM schemes. Then, we construct the BPRT based on our BEPM. Our BPRT ensures the privacy preserving of transaction contents in group transmissions, and the encrypted transaction contents avoid exposing user identity information at the same time. It enables auditor to moderately and reliably make audit of transaction contents. Furthermore, we present formal security analysis of the proposed scheme. It has been proved that our scheme satisfies transaction confidentiality, receiver anonymity and audit reliability. Subsequently, experimental results indicate that the proposed BEPM enables fast encryption and decryption, and the computation of our BPRT is in milliseconds.

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Quisquis: A New Design for Anonymous Cryptocurrencies

Cited by 68 publications

References 32 publications

Privacy-preserving auditable token payments in a permissioned blockchain system

Privacy-preserving auditable token payments in a permissioned blockchain system

Privacy and Cryptocurrencies—A Systematic Literature Review

BPRT: A blockchain‐based privacy‐preserving transaction scheme based on an efficient broadcast encryption with personalized messages

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