Lightweight Backup and Efficient Recovery Scheme for Health Blockchain Keys

Blockchain is a technology of recording ledgers in a distributed manner. It uses a consensus mechanism, digital signature and hash chains to realize the reliable storage of ledgers, and provide services such as traceability, integrity and no-repudiation for transactions in ledgers in a decentralized way. These services make blockchain have great application potentiality in the fields of healthcare, Fintech, computational law and so on. Before wide spreading its applications, blockchain must solve problems such as efficiency and privacy. Among these problems the privacy is an important one. Because blocks on blockchain are open, when transactions in blocks involve privacy data, these data can be leaked. Thus, certain security mechanisms must be built to protect privacy data. The core of these mechanisms is the appropriate key management schemes. However, blockchain is a developing technology, and few studies have been done on key management schemes for it. Because healthcare is a big application scenario of blockchain, in this paper, according to the features of health blockchain, we use body sensor network to design a lightweight backup and efficient recovery scheme for keys of health blockchain. Analyses show that the scheme has high security and performance, and it can be used to protect privacy messages on health blockchain effectively and to promote the application of health blockchain.