Efficient ring signature for cross-chain data sharing in blockchain-enabled cold-chain logistics system.

Blockchain-enabled cold-chain logistics system (BCCLS) has solved the centralized problem in traditional CCLS system. However, along with that different logistics entities establish their own distributed blockchain ledger, it brings new "data island" and privacy leakage problems for BCCLS. In this paper, a transaction ring signing model with multi-chain fusion (MCF) mechanism has been introduced first which helps achieve secure cross-chain data sharing. The MCF mechanism utilizes the relay chain technology to establish a cross-chain transaction platform among different chains. The transaction ring signing model establishes a ring signature mechanism for one cold-chain logistics product circulating in different institutions. Meanwhile, a ring signature (RS) scheme based on lattice assumption is proposed, which can improve the anti-quantum security of transaction ring signing model. This RS is constructed by lattice assumption which can anti-quantum attack security for cross-chain transaction in BCCLS. Then, the security proof shows that the RS scheme can achieve anonymity under full key exposure and unforgeability under insider attack. The efficiency comparison shows that the RS scheme is efficient than similar schemes, and the performance evaluation shows that the transaction ring signing model with MCF model is efficient and practical.