International Association for Cryptologic Research

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Found 19000 results
Anonymous and Publicly Linkable Reputation Systems
Eprint
https://eprint.iacr.org/2014/546
Johannes Blömer Jakob Juhnke Christina Kolb
We consider reputation systems where users are allowed to rate products that they purchased previously. To obtain trustworthy reputations, they are allowed to rate these products only once. As long as they do so, the users...
last revised 13 Mar 2015
Practical, Anonymous, and Publicly Linkable Universally-Composable Reputation Systems
Eprint
https://eprint.iacr.org/2018/029
Johannes Blömer Fabian Eidens Jakob Juhnke
We consider reputation systems in the Universal Composability Framework where users can anonymously rate each others products that they purchased previously. To obtain trustworthy, reliable, and honest ratings, users are...
last revised 8 May 2018
Fully-Featured Anonymous Credentials with Reputation System
Eprint
https://eprint.iacr.org/2018/835
Kai Bemmann Johannes Blömer Jan Bobolz Henrik Bröcher Denis Diemert Fabian Eidens Lukas Eilers Jan Haltermann Jakob Juhnke Burhan Otour Laurens Porzenheim Simon Pukrop Erik Schilling Michael Schlichtig Marcel Stienemeier
We present $\mathsf{CLARC}$ (Cryptographic Library for Anonymous Reputation and Credentials), an anonymous credentials system (ACS) combined with an anonymous reputation system. Using $\mathsf{CLARC}$, users can receive...
last revised 5 Sep 2018
A New Approach to Modelling Centralised Reputation Systems
Eprint
https://eprint.iacr.org/2019/453
Lydia Garms Elizabeth A. Quaglia
A reputation system assigns a user or item a reputation value which can be used to evaluate trustworthiness. Bl{\"o}mer, Juhnke and Kolb in 2015, and Kaafarani, Katsumata and Solomon in 2018, gave formal models for...
received 3 May 2019
Updatable Anonymous Credentials and Applications to Incentive Systems
Eprint
https://eprint.iacr.org/2019/169
Johannes Blömer Jan Bobolz Denis Diemert Fabian Eidens
In this paper, we introduce updatable anonymous credential systems (UACS) and use them to construct a new privacy-preserving incentive system. In a UACS, a user holding a credential certifying some attributes can interact with...
last revised 18 Feb 2019
Johannes Blömer
Author
https://iacr.org/cryptodb/data/author.php?authorkey=1150
Decentralized Blacklistable Anonymous Credentials with Reputation
Eprint
https://eprint.iacr.org/2017/389
Rupeng Yang Man Ho Au Qiuliang Xu Zuoxia Yu
Blacklistable anonymous credential systems provide service providers with a way to authenticate users according to their historical behaviors, while guaranteeing that all users can access services in an anonymous and...
last revised 4 May 2017
Beaver: A Decentralized Anonymous Marketplace with Secure Reputation
Eprint
https://eprint.iacr.org/2016/464
Kyle Soska Albert Kwon Nicolas Christin Srinivas Devadas
Amid growing concerns of government surveillance and corporate data sharing, web users increasingly demand tools for preserving their privacy without placing trust in a third party. Unfortunately, existing centralized...
last revised 20 Aug 2016
Cryptanalysis of A Privacy-Preserving Smart Metering Scheme Using Linkable Anonymous Credential
Eprint
https://eprint.iacr.org/2015/1066
Haipeng Qu Peng Shang Xi-Jun Lin Lin Sun
To accomplish effective privacy protection in smart grid systems, various approaches were proposed combining information security technology with the smart grid's new features. Diao et al. proposed a privacy-preserving scheme...
received 1 Nov 2015
Jakob Juhnke
Author
https://iacr.org/cryptodb/data/author.php?authorkey=8653
Christina Kolb
Author
https://iacr.org/cryptodb/data/author.php?authorkey=8654
Linkable Spontaneous Anonymous Group Signature for Ad Hoc Groups
Eprint
https://eprint.iacr.org/2004/027
Joseph K. Liu Victor K. Wei Duncan S. Wong
We present a linkable spontaneously anonymous group (LSAG) signature scheme (alternatively known as linkable ring signature scheme) satisfying the following three properties. (1) Anonymity, or signer indistinguishability. (2)...
last revised 1 May 2004
Fair and Efficient Secure Multiparty Computation with Reputation Systems
Iacrpub
https://iacr.org/cryptodb/data/paper.php?pubkey=24984
Gilad Asharov Yehuda Lindell Hila Zarosim
Asiacrypt 2013
pRate: Anonymous Star Rating with Rating Secrecy
Eprint
https://eprint.iacr.org/2019/378
Jia Liu Mark Manulis
We introduce pRate, a novel reputation management scheme with strong security and privacy guarantees for the users and their reputation scores. The reputation scores are computed based on the (aggregated) number(s) of stars...
received 9 Apr 2019
Enhanced Security of Attribute-Based Signatures
Eprint
https://eprint.iacr.org/2018/874
Johannes Bl{\"o}mer Fabian Eidens Jakob Juhnke
Despite the recent advances in attribute-based signatures (ABS), no schemes have yet been considered under a strong privacy definition. We enhance the security of ABS by presenting a strengthened simulation-based privacy...
last revised 28 Sep 2018
Fair and Efficient Secure Multiparty Computation with Reputation Systems
Eprint
https://eprint.iacr.org/2013/824
Gilad Asharov Yehuda Lindell Hila Zarosim
A reputation system for a set of entities is essentially a list of scores that provides a measure of the reliability of each entity in the set. The score given to an entity can be interpreted (and in the reputation system...
received 5 Dec 2013
A trustless privacy-preserving reputation system
Eprint
https://eprint.iacr.org/2016/016
Alexander Schaub Rémi Bazin Omar Hasan Lionel Brunie
Reputation systems are crucial for distributed applications in which users have to be made accountable for their actions, such as e-commerce websites. However, existing systems often disclose the identity of the raters, which...
received 7 Jan 2016
Anonymous Post-Quantum Cryptocash
Eprint
https://eprint.iacr.org/2017/716
Huang Zhang Fangguo Zhang Haibo Tian Man Ho Au
In this paper, we construct an anonymous and decentralized cryptocash protocol which is secure in the quantum computation model. In order to achieve that, a linkable ring signature based on the ideal lattice is proposed. The...
last revised 1 Apr 2018
Traceable and linkable ring signatures, traceable range proofs and applications on regulatable privacy-preserving blockchains
Eprint
https://eprint.iacr.org/2019/925
Wulu Li Lei Chen Xin Lai Xiao Zhang Jiajun Xin
Privacy protection has been extensively studied in the current blockchain research field. As representations, Monero and Zerocash have realized completely anonymous and amount-hiding transactions. However, nonregulation can...
received 14 Aug 2019
Compact linkable ring signatures and applications
Eprint
https://eprint.iacr.org/2019/654
Brandon Goodell Sarang Noether RandomRun
We describe an efficient linkable ring signature scheme, compact linkable spontaneous anonymous group (CLSAG) signatures, for use in confidential transactions. Compared to the existing signature scheme used in Monero, CLSAG...
last revised 26 Jul 2019
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