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