Practical and secure policy-based chameleon hash for redactable blockchains

【Author】 Li, Nan; Li, Yingjiu; Manulis, Mark; Tian, Yangguang; Yang, Guomin

【Source】COMPUTER JOURNAL

【影响因子】1.762

【Abstract】Policy-based chameleon hash functions have been widely proposed for its use in blockchain rewriting systems. They allow anyone to create a mutable transaction associated with an access policy, while an authorized user who possesses sufficient rewriting privileges from a trusted authority satisfying the access policy can rewrite the mutable transaction. However, existing chameleon hash functions lack certain fundamental security guarantees, including forward security and backward security. In this paper, we introduce a new primitive called forward/backward-secure policy-based chameleon hash (FB-PCH for short). We present a practical instantiation. We prove that the proposed scheme achieves forward/backward-secure collision-resistance, and show its practicality through implementation and evaluation analysis.

【Keywords】

【发表时间】2024 2024 JUL 30

【收录时间】2024-08-07

【文献类型】实验仿真

【主题类别】

区块链技术-核心技术-可编辑区块链