【Author】
Wijaya, Dimaz Ankaa; Liu, Joseph K.; Steinfeld, Ron; Liu, Dongxi; Yu, Jiangshan
【Source】PROCEEDINGS OF THE 2019 ACM ASIA CONFERENCE ON COMPUTER AND COMMUNICATIONS SECURITY (ASIACCS '19)
【Abstract】Monero, ranked as one of the top privacy-preserving cryptocurrencies by market cap, introduced semi-annual hard fork in 2018. Although hard fork is not an uncommon event in the cryptocurrency industry, the two hard forks in 2018 caused an anonymity risk to Monero where transactions became traceable due to the problem of key reuse. This problem was triggered by the existence of multiple copies of the same coin on different Monero blockchain branches such that the users spent the coins multiple times without preemptive action. We investigate the Monero hard fork events by analysing the transaction data on three different branches of the Monero blockchain. Although we have discovered an insignificant portion of traceable inputs compared to the total available inputs in our dataset, our analyses show that the scalability of the event depends on external factors such as market price and market availability. We propose a cheap, easy to implement strategy to prevent the problem of key reuse, should in the future stronger Monero forks emerge in the market.
【Keywords】Monero; key reuse; hard fork; traceability; anonymity; ring signature; cryptocurrency
【摘要】按市值计算，Monero是顶级隐私保护加密货币之一，于2018年推出半年一次的hard fork。虽然硬叉在加密货币行业并不少见，但2018年的两个硬叉给Monero带来了匿名风险，因为密钥重用问题，交易变得可追踪。这个问题是由同一硬币在不同Monero区块链分支上的多个副本引发的，因此用户在没有先发制人行动的情况下多次使用硬币。我们通过分析Monero区块链三个不同分支上的交易数据来调查Monero硬叉事件。虽然我们发现，与数据集中的总可用输入相比，可追溯输入的比例微不足道，但我们的分析表明，事件的可扩展性取决于外部因素，如市场价格和市场可用性。我们提出了一种廉价、易于实施的策略，以防止密钥重用问题，如果未来市场上出现更强大的Monero forks。
【关键词】门罗币；密钥重用；硬叉；可追踪性；匿名性；环签名；加密货币
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