2006 First International Multi-Symposiums on Computer and Computational Sciences
An Improvement of an Identity-Based Key Issuing Protocol
Hangzhou, Zhejiang, China
June 20-June 24
ISBN: 0-7695-2581-4
At ICPADS 2005, Sui et al. proposed a novel separable and anonymous ID-based key issuing scheme without secure channel, and claimed the key-escrow problem has been solved. In this paper, we present a security analysis on their schemes and point out that their two protocols are not secure and they do not solve the key-escrow problem. Further,we present an improved key issuing protocol which is proved to be secure against adaptive chosen message attack without the random oracle model under the q - SDH assumption.
Citation:
Feng Cao, Zhenfu Cao, Licheng Wang, "An Improvement of an Identity-Based Key Issuing Protocol," imsccs, vol. 2, pp.13-18, 2006 First International Multi-Symposiums on Computer and Computational Sciences, 2006
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