Cryptology ePrint Archive: Report 2008/103

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

Jun Shao and Dongsheng Xing and Zhenfu Cao

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.

Category / Keywords: public-key cryptography / proxy re-encryption, ID-based

Date: received 10 Mar 2008, withdrawn 16 Dec 2008

Contact author: chn junshao at gmail com

Available format(s): (-- withdrawn --)

Version: 20081216:205238 (All versions of this report)

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