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An Improvement of an Identity-Based Key Issuing Protocol

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3 Author(s)
Feng Cao ; Dept. of Comput. Sci. & Eng., Shanghai Jiao Tong Univ. ; Zhenfu Cao ; Licheng Wang

At TCP ADS 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

Published in:

Computer and Computational Sciences, 2006. IMSCCS '06. First International Multi-Symposiums on  (Volume:2 )

Date of Conference:

20-24 June 2006