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Paper: Identity-Based Proxy Re-encryption Schemes with Multiuse, Unidirection, and CCA Security

Authors:
Jun Shao
Dongsheng Xing
Zhenfu Cao
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URL: http://eprint.iacr.org/2008/103
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Abstract: A proxy re-encryption (PRE) scheme allows a proxy to transform a ciphertext under Alice's public key into a ciphertext under Bob's public key on the same message. In 2006, Green and Ateniese extended the above notion to identity-based proxy re-encryption (IB-PRE), and proposed two open problems \cite{GA06}: building 1. IB-PRE schemes which are CCA-secure in the standard model; 2. multi-use CCA-secure IB-PRE schemes. Chu and Tzeng proposed two identity-based proxy re-encryption schemes afterwards in \cite{CT07}, aiming at solving the two open problems. However, in this paper, we show that they don't solve these two open problems by revealing a security flaw in their solution. Furthermore, we propose an improvement which is a solution to the open problems.
BibTeX
@misc{eprint-2008-17780,
  title={Identity-Based Proxy Re-encryption Schemes with Multiuse, Unidirection, and CCA Security},
  booktitle={IACR Eprint archive},
  keywords={public-key cryptography / proxy re-encryption, ID-based},
  url={http://eprint.iacr.org/2008/103},
  note={ chn.junshao@gmail.com 13948 received 10 Mar 2008},
  author={Jun Shao and Dongsheng Xing and Zhenfu Cao},
  year=2008
}