Journal of Computer Applications ›› 2011, Vol. 31 ›› Issue (11): 2983-2985.DOI: 10.3724/SP.J.1087.2011.02983
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LI Zhi-min,XU Xin,LI Cun-hua
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李志敏,徐馨,李存华
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Abstract: Liu's online/offline signcryption scheme (LIU J K, BAEK J, ZHOU J. Online/offline identity-based signcryption re-visited. Inscrypt'10: Proceedings of the 6th International Conference on Information Security and Cryptology. Berlin: Springer-Verlag, 2010:90-102) was cryptanalyzed and improved in this paper. By studying the unforgeability of Liu's scheme, this paper proved that Liu's scheme would be not unforgeable against adaptive chosen message and identity attack. To overcome the security problem in Liu's scheme, a modified scheme was proposed, and the modified scheme was proved to be a secure Identity-based online/offline signcryption scheme.
Key words: signcryption, identity based, bilinear pairing, provably secure, Random Oracle Model (ROM)
摘要: 对Liu等人提出的基于身份的在线/离线签密方案(LIU J K, BAEK J, ZHOU J. Online/offline identity-based signcryption re-visited. Inscrypt'10: Proceedings of the 6th International Conference on Information Security and Cryptology. Berlin: Springer-Verlag, 2010:90-102)进行了密码分析和改进。研究了Liu方案的不可伪造性,证明了Liu方案不能抵抗自适应选择消息和身份攻击,是可伪造的,并提出了对Liu方案的一个修改方案。修改方案克服了Liu方案中存在的安全漏洞,是一个安全的基于身份的在线/离线签密方案。
关键词: 签密, 基于身份, 双线性对, 可证安全, 随机预言模型
LI Zhi-min XU Xin LI Cun-hua. Cryptanalysis and improvement of an online/offline signcryption scheme[J]. Journal of Computer Applications, 2011, 31(11): 2983-2985.
李志敏 徐馨 李存华. 一个在线/离线签密方案的分析和改进[J]. 计算机应用, 2011, 31(11): 2983-2985.
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URL: http://www.joca.cn/EN/10.3724/SP.J.1087.2011.02983
http://www.joca.cn/EN/Y2011/V31/I11/2983