Efficient Conditional Proxy Re-encryption with Chosen-Ciphertext Security


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Weng, Jiang and Yang, Yanjiang and Tang, Qiang and Deng, Robert H. and Bao, Feng (2009) Efficient Conditional Proxy Re-encryption with Chosen-Ciphertext Security. In: Information Security. Lecture Notes in Computer Science, 5735 . Springer Verlag, Heidelberg, pp. 151-166. ISBN 9783642044731

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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.
Item Type:Book Section
Copyright:© 2009 Springer
Faculty:
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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Link to this item:http://purl.utwente.nl/publications/68365
Official URL:http://dx.doi.org/10.1007/978-3-642-04474-8_13
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