Protecting Data Privacy for Permissioned Blockchains using Identity-Based Encryption

Blockchain is an emerging decentralized architecture and distributed public ledger technology underlying Bitcoin, and has recently attracted intensive attention from governments, financial institutions and high-tech enterprises. It is believed that blockchain can improve efficiency, reduce costs and enhance data security, but it is still in the face of serious privacy issues which may hinder the wide application of blockchain. In this paper, We present a practical scheme by adding the Identity-Based encryption system, which effectively improves the data privacy for non-transaction applications. Analyses show that our proposal has a high security level which can prevent both disguise and passive attacks, and is functional, effective and practical in many applications for non-transactional scenarios.