Secure Ring Signature Scheme for Privacy-Preserving Blockchain

【Author】 Wang, Lin; Peng, Changgen; Tan, Weijie

【Source】ENTROPY

【影响因子】2.738

【Abstract】Blockchain integrates peer-to-peer networks, distributed consensus, smart contracts, cryptography, etc. It has the unique advantages of weak centralization, anti-tampering, traceability, openness, transparency, etc., and is widely used in various fields, e.g., finance and healthcare. However, due to its open and transparent nature, attackers can analyze the ledger information through clustering techniques to correlate the identities between anonymous and real users in the blockchain system, posing a serious risk of privacy leakage. The ring signature is one of the digital signatures that achieves the unconditional anonymity of the signer. Therefore, by leveraging Distributed Key Generation (DKG) and Elliptic Curve Cryptography (ECC), a blockchain-enabled secure ring signature scheme is proposed. Under the same security parameters, the signature constructed on ECC has higher security in comparison to the schemes using bilinear pairing. In addition, the system master key is generated by using the distributed key agreement, which avoids the traditional method of relying on a trusted third authorizer (TA) to distribute the key and prevents the key leakage when the TA is not authentic or suffers from malicious attacks. Moreover, the performance analysis showed the feasibility of the proposed scheme while the security was ensured.

【Keywords】blockchain; ring signature; privacy protection; distributed key generation; elliptic curve cryptography

【发表时间】2023 SEP

【收录时间】2023-10-20

【文献类型】实验仿真

【主题类别】

区块链技术-协同技术-隐私保护