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Author: Admin | 2025-04-27
Holders, investors, arbitrageurs, market makers, speculators and hedgers. There are presently more than 500 crypto asset exchanges to bring together buyers and sellers, where crypto assets are traded for either different digital currencies, or for other assets such as conventional fiat money. These exchanges operate mostly outside Western countries, and range from fully-online platforms to bricks-and-mortar businesses. Currently, almost two thirds of all daily global crypto asset trading volume results from activity on just ten of these exchanges. [Show full text] Unique Ring Signatures: a Practical Construction Unique Ring Signatures: A Practical Construction Matthew Franklin and Haibin Zhang Dept. of Computer Science, University of California, Davis, California 95616, USA {franklin,hbzhang}@cs.ucdavis.edu Abstract. We propose unique ring signatures that simplify and capture the spirit of linkable ring signatures. We use new techniques to provide an instantiation which can be tightly related to the DDH problem in the random oracle model, leading to the most efficient linkable/unique ring signature. Keywords: anonymity, authentication, e-voting system, provable secu- rity, ring signature, tight reduction, unique signature, verifiable random function. 1 Introduction Ring signatures [23] are very useful tools for many privacy-preserving applica- tions. However, they are not adequate in settings where some degree of priva- cy for users must be balanced against limited access. For example, a service provider might have the list of public keys that correspond to all users that have purchased a single access to some confidential service for that day (re- quiring anonymous authentication). For this kind of application, a number of restricted-use ring signatures are proposed. Notable examples include linkable ring signatures [1, 7, 19, 20, 25, 26] and traceable ring signatures [13, 14]. Linkable ring signature asks that if a user signs any two messages (same or different) with respect to the same ring, then an efficient public procedure can verify that the signer was the same (although the user's identity is not revealed). Traceable ring signature is a ring signature scheme where each message is signed not only with respect to a list of ring members, but also with respect to an issue (e.g., identifying label of a specific
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