A Fine-Grained Medical Data Sharing Scheme with Ciphertext Reencryption

Author:

Chen Jiahao1ORCID,Wang Jingwei1ORCID,Yin Xinchun12ORCID,Ning Jianting34ORCID

Affiliation:

1. College of Information Engineering, Yangzhou University, Yangzhou, China

2. College of Guangling, Yangzhou University, Yangzhou, China

3. College of Computer and Cyberspace Security, Fujian Normal University, Fuzhou, China

4. Institute of Information Engineering, Chinese Academy of Sciences, Beijing, China

Abstract

With the fantastic development of cloud computing technology, cloud storage has been widely applied in the field of medical data sharing due to its efficiency and flexibility. Attribute-based encryption (ABE), as a promising technology, plays an important role in the fine-grained sharing of medical data. However, there are two issues: (1) an access policy specified in the encryption phase may need to be updated after a period of time, and (2) the considerable decryption overhead in ABE is too heavy for resource-limited devices. To address these issues, a fine-grained medical data sharing scheme with ciphertext reencryption is proposed. Users with decryption permission can produce reencryption keys and cloud server can reencrypt initial ciphertext. The cloud server can predecrypt ciphertext, which reduces user’s decryption overhead. Moreover, the traditional centralized server is replaced with a decentralized blockchain that performs system initialization, key management, and user revocation. We compared the proposed scheme with some existing schemes in terms of function and efficiency; the results show that the efficiency of the proposed scheme outperforms other related schemes. The security analysis shows that the proposed scheme is security and correctness.

Funder

Foundation of State Key Laboratory of Information Security

Publisher

Hindawi Limited

Subject

Electrical and Electronic Engineering,Computer Networks and Communications,Information Systems

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