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  • 常裕沛,禹勇,魏建国,孙琦龙.可追责的可修订区块链[J].信息安全学报,已采用    [点击复制]
  • Chang Yupei,Yu Yong,Wei Jianguo,Sun Qilong.Accountable and Redactable Blockchain[J].Journal of Cyber Security,Accept   [点击复制]
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可追责的可修订区块链
常裕沛1, 禹勇1, 魏建国2, 孙琦龙2
0
(1.陕西师范大学;2.青海民族大学)
摘要:
近年来,区块链技术的研究与应用发展正呈现出爆发式增长,它的出现对现有的科技、金融、社会生活领域均产生深远影响。除传统的比特币交易外,大量的社会数据也被存储在区块链系统中。社会数据的内容参差不齐,有些链上内容可能会对公众、社会舆论以及某些群体带来不可磨灭的负面影响。区块链不可篡改的特性可以保证数据永久存储在链上,但也导致链上的恶意信息无法被删除、错误数据无法被修改,因此对区块链中非法数据的修改具有现实意义。可修订区块链提供了对区块链信息的重写功能,当前主要集中在修订方法的研究,并未对修订权限进行监管,这将导致修订者权限过大,存在恶意修订行为。针对这一问题,本文提出了可追责的可修订区块链,在抗密钥泄漏的变色龙哈希函数的基础上,结合环签名和可验证加密技术,保护合法修订人身份隐私,同时在发生修订争议时可追踪到恶意用户的身份,实现对数据修订者的可控监管。文中形式化定义了方案的安全模型,包括抗碰撞性和不可区分性,并给出了安全性证明。最后,对提出的算法进行仿真实验,结果表明算法高效且具有现实可操作性。
关键词:  可修订区块链  变色龙哈希  环签名  ElGamal加密
DOI:
投稿时间:2022-02-19修订日期:2022-04-01
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
Accountable and Redactable Blockchain
Chang Yupei1, Yu Yong1, Wei Jianguo2, Sun Qilong2
(1.Shaanxi Normal University;2.Qinghai Nationalities University)
Abstract:
For the past few years, the research and application development of blockchain technology is showing an explosive up-ward trend, and its emergence has had a profound impact on many existing fields, such as science technology, finance, and social life. In addition to the traditional Bitcoin transactions, a large amount of social data is stored on blockchain systems as well. There are both positive and negative contents of social data, and some on-chain contents may bring in-delible negative effects on the public, social opinion and some groups. The immutability feature of blockchain guarantees that the data will be permanently stored on the chain without tampering. While, at the same time, it makes the malicious on-chain information unable to be removed and the incorrect data cannot be modified. Therefore, the modification of illegal data in the blockchain has practical significance. Redactable blockchain provides the function of rewriting for blockchain information. Currently, the research is mainly focused on the redaction methods, instead of supervision on the redaction authority of blockchain information, which leads to the excessive authority of the redactor who may have ma-licious redaction behavior. In response to this problem, this paper proposes an accountable and redactable blockchain protocol. Based on the chameleon hash function without key exposure, in our protocol, we take advantage of the ring signature and the verifiable encryption techniques to protect the identity privacy of legal redactor, and track the identity of malicious users when the revision dispute occurs, so as to realize the controllable supervision of redactors. The security model of our protocol is formalized in this paper, including collision resistance and indistinguishability, and the security proof of the proposed scheme is provided. Finally, a simulation experiment is carried out on the proposed algorithm, and the experimental results show that the algorithm is efficient and practical.
Key words:  redactable blockchain  chameleon hash  ring signature  ElGamal encryption