Redactable Blockchain in Decentralized Setting

【Author】 Ma, Jinhua; Xu, Shengmin; Ning, Jianting; Huang, Xinyi; Deng, Robert H.

【Source】IEEE TRANSACTIONS ON INFORMATION FORENSICS AND SECURITY

【影响因子】7.231

【Abstract】Immutability has been widely accepted as a fundamental property protecting the security of blockchain technology. However, this property impedes the development of blockchain because of the abuse of blockchain storage and legal obligations. To mitigate this issue, a novel construction of blockchain, called redactable blockchain, was introduced. It enables a central authority to issue the rewriting privilege to a particular party who can rewrite a registered object, e.g., a block or a transaction, in a controlled way. Unfortunately, the central authority must be fully trusted and is an obvious target suffering from various attacks. In this paper, we introduce a redactable blockchain controlled at a fine-grained level in a decentralized setting. In our solution, the rewriting privilege is issued by multiple authorities for reducing the vulnerability of the centralized setting. To formalize our solution, we introduce a novel cryptographic notion, called decentralized policy-based chameleon hash (DPCH), with the formal definition and security model. By applying several simple cryptographic tools, such as chameleon hash, digital signature, and multi-authority attribute-based encryption, we present the generic construction of DPCH along with rigorous security proofs. By applying RSA-based chameleon hash and BLS short signature, we give a practical instantiation of DPCH with performance evaluation. The comprehensive evaluation shows that our solution has superior performance than the state-of-the-art solution.

【Keywords】Blockchains; Security; Digital signatures; Encryption; Probabilistic logic; Network security; Computer crime; Chameleon hash; redactable blockchain; decentralized blockchain rewriting

【发表时间】2022

【收录时间】2022-04-05

【文献类型】期刊

【主题类别】

区块链技术-密码学-