BFOD: Blockchain-Based Privacy Protection and Security Sharing Scheme of Flight Operation Data

With the rapid growth of flight operation data, how to alleviate the contradiction between data sharing and privacy protection of civil aviation corporations has become a challenging problem. Therefore, a blockchain-based flight operation data sharing scheme, named BFOD is designed to achieve the privacy protection and secure sharing of flight operation data. In BFOD, physical entities of airlines, airports and air traffic control are divided into data owners, data requesters and authorization institutes according to the business logic. First, the authorization institute grants a hash anonymous identity and different levels of access right for each civil aviation corporation. When the data are accessed, a hash anonymous identity is designed to verify the access right of the data requester, which protects identity privacy. Then, zero-knowledge succinct noninteractive argument of knowledge (zk-SNARKs) is employed to verify whether the flight operation data meets the specific requirements raised by the data requester without disclosing data privacy. Finally, a proxy re-encryption is used to improve the sharing efficiency of flight operation data. In addition, a grouped practical Byzantine fault tolerant (PBFT) algorithm is proposed to reduce consensus latency. The theoretical analysis and experimental results show that the consensus latency of the grouped PBFT algorithm reduces 91.4% under the number of consensus node $\text{N}=$ 100, and the BFOD meets data confidentiality, availability and privacy protection, which is feasible and efficient.