title: A practical application of CP-ABE for mobile PHR system: a study on the user accountability.
abstract: BACKGROUND
  Attribute based encryption has been widely applied for secure data protection in PHR systems. However, since different users may share the same attributes in the system, a user may leaks his private key for illegal data sharing without being detected. This will add more threat to the private data stored in PHR system.
  
  
  RESULTS
  To help users achieve higher efficiency and more secure data sharing in mobile PHR system, based on previous works, we study the traitor tracing mechanism in attribute based cryptosystem and propose a high efficient attribute based encryption with user accountability in mobile PHR system. If a malicious PHR user exposes his private key for illegal data sharing, his identity can be accurately pinpointed by the system manager. During the whole process of data sharing, no bilinear pairing operations are needed, hence this will the mobile terminal devices from heavy computation burden.
  
  
  CONCLUSIONS
  As a further study, in this short report, we show that using a novel attribute based encryption with user accountability can help users achieve better efficiency and more secure data sharing in mobile PHR system.
authors: Key Lab of Broadband Wireless Communication and Sensor Network Technology, Nanjing University of Posts and Telecommunications, Nanjing, China.
authors: Hanshu
authors: H
authors: Hong
authors: Inter-College Program in Genetics, Pennsylvania State University, University Park, PA USA.
authors: Di
authors: D
authors: Chen
authors: Key Lab of Broadband Wireless Communication and Sensor Network Technology, Nanjing University of Posts and Telecommunications, Nanjing, China.
authors: Zhixin
authors: Z
authors: Sun
keywords: CP-ABE; Mobile PHR system; User accountability