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《Computer Knowledge and Technology》 2017-33
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Improved Identity Based online Offline Encryption Scheme

WANG Zhan-jun;MA Hai-ying;School of Science, Nantong University;College of Computer Science and Technology, Nantong University;  
The existing identity Based online offline encryption(IBOOE) schemes in the exponent inverse model are of the highest online computation efficiency and the shortest ciphertxt size. However the user private key is fully determined by the user identity, which leads the schemes vulnerable against the private key leakage attack. This paper introduces the online offline technique into Boneh etc's identity based encryption and proposes a improved IBOOE. Compared with the previous IBOOE in the exponent inverse model, it is of the same efficiency while adding a random number into the private key. Thus we remedy the weakness of the previous private key and our scheme strengthen the security against the private key leakage attack greatly.
【Fund】: 南通大学博士科研启动基金(No.15B10);南通大学自然科学基金(No.15z06);; 江苏省高校自然科学研究基金资助项目(No.15KJB520029 No.16KJB520038);; 2015年度江苏省现代教育技术研究课题(No.2015-R-40624)
【CateGory Index】: TP309.7
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