Blockchain-Based Privacy-Preserving Vaccine Passport System

【Author】 Cao, Yangzhou; Chen, Jiageng; Cao, Yajun

【Source】SECURITY AND COMMUNICATION NETWORKS

【影响因子】1.968

【Abstract】In this study, we propose a blockchain-based privacy-preserving vaccine passport system for the global prevention and control of infectious diseases. The system operates a double-chain framework which consists of a public blockchain and a consortium blockchain. Among them, the combination of the immutability of the public blockchain and Internet of Things (IoT) technology in the supply chain ensures the openness and transparency of the cold chain logistics records of the vaccines covering the stages from auditing to the target vaccination hospitals. The system adopts the consortium blockchain to achieve the balance between the protection of users' vaccination privacy and auditing by the government departments. Specifically, a distributed system-based threshold signature is adopted in the vaccine qualification phase to resist collusion between the vaccine manufacturing company and vaccine approval institutions. The cryptographic tools such as the anonymous credentials, zero-knowledge protocols, and range proofs ensure that users do not disclose any private information other than proving that they have a legally valid vaccine passport when users display the vaccine passports to customs. At the same time, customs can apply various vaccine prevention policies based on the conditions on the specific vaccine passports. Regarding the security properties of the system, a formal security model is given along with the corresponding security proofs.

【Keywords】

【发表时间】2022 21-Mar

【收录时间】2022-07-25

【文献类型】理论性文章

【主题类别】

区块链技术-协同技术-隐私计算