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Practical Identity-Based Encryption (IBE) in Multiple PKG Environments and Its Applications
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| Abstract: | Identity-based encryption (IBE) schemes are usually used in multiple-PKG environments --- on the one hand, each administrative domain (e.g., a relatively small and close organization) maintains its own private key generator (PKG); on the other hand, encryption across domains becomes a prevalent requirement. In this paper, we present a new IBE scheme using bilinear pairings. Compared with the famous IBE scheme of Boneh and Franklin, we show that ours is more practical in the multiple-PKG environment. We prove that our scheme meets chosen ciphertext security in the random oracle model, assuming the intractability of the standard Bilinear Diffie-Hellman (BDH) problem. As an application of our IBE scheme, we also propose an escrowed ElGamal scheme which possesses certain good properties in practice. |
BibTeX
@misc{eprint-2007-13382,
title={Practical Identity-Based Encryption (IBE) in Multiple PKG Environments and Its Applications},
booktitle={IACR Eprint archive},
keywords={identity-based encryption (IBE), multiple-PKG environments; public key encryption (PKE), escrowed ElGamal, bilinear pairings},
url={http://eprint.iacr.org/2007/100},
note={In submission shengbaowang@gmail.com 13843 received 19 Mar 2007, last revised 26 Nov 2007},
author={Shengbao Wang and Zhenfu Cao},
year=2007
}