Simulatability and security of certificateless threshold signatures

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• 作者：Licheng Wang ; Zhenfu Cao ; Xiangxue Li ; Haifeng Qian
• 关键词：Digital signature ; Key escrow ; Certificateless ; Threshold ; Provable security ; Simulatabilty
• 刊名：Information Sciences
• 出版年：2007
• 期刊代码：62_00200255
• 类别：cp
• 出版时间：15 March 2007
• 卷：177
• 期：6
• 页码：1382-1394
• 文件大小：211 K

摘要

We analyze the relationship between the notion of certificateless public key cryptography (CL-PKC) and identity-based schemes without a trusted private key generator (PKG), formally define the security of certificateless threshold signatures, and propose a concrete implementation based on bilinear pairings. To exhibit the security of our proposal, we develop the theory of simulatability and relationship between the certificateless threshold signatures and the underlying (non-threshold) ID-based signatures. We show that the proposed scheme is robust and existentially unforgeable against adaptively chosen message attacks under CDH assumption in the random oracle model.