Zhao Hong, Bai Xue, Zheng Shihui, Wang Licheng
State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing 100876, China.
Technical Department, Golden Siv Technology Limited, Level 7, K11 ATELIER Victoria Dockside, 18 Salisbury Rd, Tsim Sha Tsui, Hong Kong, China.
Entropy (Basel). 2020 Jun 27;22(7):712. doi: 10.3390/e22070712.
As the blockchain 2.0 platform, Ethereum's turing complete programming language and smart contract components make it play an important role in the commercialization of blockchain. With the further development of blockchain applications, the privacy and security issues of Ethereum have gradually emerged. To solve this problem, we proposed a blockchain privacy protection model called RZcash in the previous work. It implements the dynamically updateable and verifiable hiding of the asset information in Ethereum, namely the account balance and transaction amount. However, RZcash does not pay attention to the key redundancy problem that may be caused by the creation of secret accounts. In addition, the large size of proofs gives it high communication costs. In response to these problems, we further improve RZcash. For the key redundancy problem, we construct a new signature scheme based on the ciphertext equivalent test commitment. Moreover, we use the Schnorr signature and bulletproof to improve the corresponding proof scheme in RZcash, thereby reducing the size of proof. Based on these improvements, we propose a decentralized payment system, called RZcoin, based on Ethereum. Finally, we implement the algorithm model of RZcoin and evaluate its security and performance. The results show that RZcoin has higher security and Lower communication cost than RZcash.
作为区块链2.0平台，以太坊的图灵完备编程语言和智能合约组件使其在区块链商业化中发挥着重要作用。随着区块链应用的进一步发展，以太坊的隐私和安全问题逐渐显现。为了解决这个问题，我们在之前的工作中提出了一种名为RZcash的区块链隐私保护模型。它实现了以太坊中资产信息（即账户余额和交易金额）的动态可更新和可验证隐藏。然而，RZcash没有关注到创建秘密账户可能导致的密钥冗余问题。此外，证明的规模较大使其通信成本较高。针对这些问题，我们对RZcash进行了进一步改进。对于密钥冗余问题，我们基于密文等价测试承诺构建了一种新的签名方案。此外，我们使用Schnorr签名和防弹证明来改进RZcash中的相应证明方案，从而减小证明的规模。基于这些改进，我们提出了一种基于以太坊的去中心化支付系统，称为RZcoin。最后，我们实现了RZcoin的算法模型并评估了其安全性和性能。结果表明，RZcoin比RZcash具有更高的安全性和更低的通信成本。
