An efficient linkable group signature for payer tracing in anonymous cryptocurrencies

【Author】 Zhang, Lingyue; Li, Huilin; Li, Yannan; Yu, Yong; Au, Man Ho; Wang, Baocang

【Source】FUTURE GENERATION COMPUTER SYSTEMS-THE INTERNATIONAL JOURNAL OF ESCIENCE

【影响因子】7.307

【Abstract】Cryptocurrencies, led by bitcoin launched in 2009, have obtained wide attention in recent years. Anonymous cryptocurrencies are highly essential since users need to preserve their privacy when conducting transactions. However, some users might misbehave with the cover of anonymity such as rampant trafficking or extortion. Thus, it is important to balance anonymity and accountability of anonymous cryptocurrencies. In this paper, we address this issue by proposing a linkable group signature for signing cryptocurrency transactions, which can be used to trace a payer's identity in consortium blockchain based anonymous cryptocurrencies, in case a payer misbehaves in the system. The anonymity can be retained if a user behaves honestly. We prove that the proposed scheme achieves full-anonymity, full-traceability and linkability in the random oracle model. Implementation of the proposed linkable group signature scheme demonstrates its high efficiency and thus, can be adopted in anonymous cryptocurrencies in reality. (C) 2019 Elsevier B.V. All rights reserved.

【Keywords】Cryptocurrency; Consortium blockchain; Group signatures; Accountability

【发表时间】2019 DEC

【收录时间】2022-01-02

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