Biometric identification has become increasingly popular in recent years. With the development of cloud computing,
database owners are motivated to outsource the large size of biometric data and identification tasks to the cloud to get rid of the
expensive storage and computation costs, which however brings potential threats to users’ privacy. In this paper, we propose an
efficient and privacy-preserving biometric identification outsourcing scheme. Specifically, the biometric data is encrypted and
outsourced using Block Chain.