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Mathematical Problems in Engineering
Volume 2017 (2017), Article ID 6808190, 10 pages
Research Article

Modified Ciphertext-Policy Attribute-Based Encryption Scheme with Efficient Revocation for PHR System

1School of Software Engineering, Shenzhen Institute of Information Technology, Shenzhen, China
2School of Computer and Software Engineering, Shenzhen University, Shenzhen, China

Correspondence should be addressed to Jianyong Chen

Received 26 January 2017; Accepted 3 August 2017; Published 30 August 2017

Academic Editor: Haipeng Peng

Copyright © 2017 Hongying Zheng et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Attribute-based encryption (ABE) is considered a promising technique for cloud storage where multiple accessors may read the same file. For storage system with specific personal health record (PHR), we propose a modified ciphertext-policy attribute-based encryption scheme with expressive and flexible access policy for public domains. Our scheme supports multiauthority scenario, in which the authorities work independently without an authentication center. For attribute revocation, it can generate different update parameters for different accessors to effectively resist both accessor collusion and authority collusion. Moreover, a blacklist mechanism is designed to resist role-based collusion. Simulations show that the proposed scheme can achieve better performance with less storage occupation, computation assumption, and revocation cost compared with other schemes.