Cryptanalysis and improvement of an efficient certificateless signature scheme

被引:29
|
作者
Li, Jiguo [1 ]
Huang, Xinyi [2 ]
Mu, Yi [2 ]
Wu, Wei [2 ]
机构
[1] Hohai Univ, Coll Comp & Informat Engn, Nanjing, Peoples R China
[2] Univ Wollongong, Sch Comp Sci & Software Engn, Wollongong, NSW, Australia
关键词
certificateless; cryptography; certificateless signature; public key replacement attack; security analysis;
D O I
10.1109/JCN.2008.6388323
中图分类号
TP [自动化技术、计算机技术];
学科分类号
0812 ;
摘要
In traditional digital signature schemes, certificates signed by a trusted party are required to ensure the authenticity of the public key. In Asiacrypt 2003, the concept of certificateless signature scheme was introduced. The advantage of certificateless public key cryptography successfully eliminates the necessity of certificates in the traditional public key cryptography and simultaneously solves the inherent key escrow problem suffered in identity-based cryptography. Recently, Yap et al. proposed an efficient certificateless; signature scheme and claimed that their scheme is existentially unforgeable in the random oracle model. In this paper, we show that the certificateless signature scheme proposed by Yap et al. is insecure against public key replacement attacks. Furthermore, we propose an improved certificateless; signature scheme, which is existentially unforgeable against adaptive chosen message attacks under the computational Diffie-Hellman assumption in the random oracle model and provide the security proof of the proposed scheme.
引用
收藏
页码:10 / 17
页数:8
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