General Ad Hoc Encryption from Exponent Inversion IBE

By Xavier Boyen.

In Advances in Cryptology (EUROCRYPT 2007), volume 4515 of Lecture Notes in Computer Science, pages 394-411. Springer, 2007.


Among the three broad classes of Identity-Based Encryption schemes built from pairings, the exponent inversion paradigm tends to be the most efficient, but also the least extensible: currently there are no hierarchical or other known extensions of IBE based on those schemes. In this work, we show that such extensions can be realized from IBE systems that conform to a certain abstraction of the exponent inversion paradigm. Our method requires no random oracles, and is simple and efficient.


- published paper (PS) (PDF) (also accessible from the publisher) © IACR
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  author = {Xavier Boyen},
  title = {General Ad Hoc Encryption from Exponent Inversion {IBE}},
  booktitle = {Advances in Cryptology---EUROCRYPT 2007},
  series = {Lecture Notes in Computer Science},
  volume = {4515},
  pages = {394--411},
  publisher = {Berlin: Springer-Verlag},
  year = {2007},
  note = {Available at \url{}}

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