International Association for Cryptologic Research

International Association
for Cryptologic Research


Paper: An Anonymous ID-based Encryption Revisited

Zhengjun Cao
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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.
  title={An Anonymous ID-based Encryption Revisited},
  booktitle={IACR Eprint archive},
  keywords={cryptographic protocols /  Anonymous ID-based encryption, Smooth Transition},
  note={ 14647 received 7 Feb 2010},
  author={Zhengjun Cao},