Blockchain-Based Privacy Protection Unified Identity Authentication

Blockchain is a specific type of distributed ledger with the features of high transparency and publicly verifiable which may threaten users' data privacy. Due to this concern, we propose a blockchain-based privacy protection identity authentication scheme in this paper. On the one hand, we take advantage of the decentralized feature of blockchain to safely store the hash value of users' identity information in the block of the blockchain, so that these information cannot be tampered and can be verified by the verifier. On the other hand, we introduce a set of key derivation algorithms into the scheme to provide anonymity and unlinkability. The scheme is applicable to scenarios with unified authentication and information privacy protection requirements.