An efficient and provably secure IBE scheme under the standard model

被引：1
|
作者：
Xu P. [1 ]
Cui G.-H. [1 ]
Lei F.-Y. [1 ]
Tang X.-M. [1 ]
Chen J. [2 ]
机构：
[1] Laboratory of Information Security, College of Computer Science, Huazhong Univ. of Sci. and Technol.
[2] College of Computer Science, Wuhan University
来源：
Jisuanji Xuebao/Chinese Journal of Computers | 2010年 / 33卷 / 02期
关键词：
Combined public-key; Conspiracy attack; Decisional Bilinear Diffie-Hellman Assumption; Identity-based encryption; Standard model;
D O I：
10.3724/SP.J.1016.2010.00335
中图分类号：
学科分类号：
摘要：
The Combined Public-Key scheme is a famous scheme which is commonly used to generate user's encryption-key and private-key in the identity-based encryption schemes. For overcoming the conspiracy attack on Combined Public-Key scheme, a new expanded scheme based on it is proposed in which the generation of private-key is an expansion of the corresponding part of combined public-key scheme. Based on the new expanded Combined Public-Key scheme, a new identity-based encryption scheme is proposed, and under the standard model it is provably secure based on Decisional Bilinear Diffie-Hellman Assumption. At last, by analyzing the collision of user's encryption-key and comparing the new proposed identity-based encryption scheme with three existed famously analogous schemes at the following three aspects: the tightness of reduction in security proof, the complexity of encryption and decryption and the binary length of ciphertext, it can be found that the new scheme is more efficient than them, so it is comparatively more useful.
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页码：335 / 344
页数：9
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