Cryptology ePrint Archive: Report 2010/065

An Anonymous ID-based Encryption Revisited

Zhengjun Cao

Abstract: In 2006, Boyen and Waters proposed an anonymous ID-based encryption. It is impressive that in the scheme the system secret key is a tuple of five numbers. The user's secret key is also a tuple of five elements. The authors did not explain why it should introduce so many parameters. In this paper, we simulate a general attempt to attack the scheme. It shows us which parameters are essential to the scheme and which parameters can be reasonably discarded. Based on the analysis we present a simplified version and an efficient version of the Boyen-Waters scheme. The analyzing technique developed in this paper is helpful to better other cryptographic protocols.

Category / Keywords: cryptographic protocols / Anonymous ID-based encryption, Smooth Transition

Date: received 7 Feb 2010

Contact author: zhencao at ulb ac be

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Version: 20100208:095719 (All versions of this report)

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