Efficient Conditional Proxy Re-encryption with Chosen-Ciphertext Security
BibTeX
@MISC{Weng_efficientconditional,
author = {Jian Weng and Yanjiang Yang and Qiang Tang and Roberth. Deng and Feng Bao},
title = {Efficient Conditional Proxy Re-encryption with Chosen-Ciphertext Security},
year = {}
}
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Abstract
Abstract. Recently, a variant of proxy re-encryption, named conditional proxy re-encryption (C-PRE), has been introduced. Compared with traditional proxy re-encryption, C-PRE enables the delegator to implement fine-grained delegation of decryption rights, and thus is more useful in many applications. In this paper, based on a careful observation on the existing definitions and security notions for C-PRE, we reformalize more rigorous definition and security notions for C-PRE. We further propose a more efficient C-PRE scheme, and prove its chosenciphertext security under the decisional bilinear Diffie-Hellman (DBDH) assumption in the random oracle model. In addition, we point out that a recent C-PRE scheme fails to achieve the chosen-ciphertext security.
