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Paper: Practical Identity-Based Encryption (IBE) in Multiple PKG Environments and Its Applications

Authors:
Shengbao Wang
Zhenfu Cao
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URL: http://eprint.iacr.org/2007/100
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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
}