Efficient Conditional Proxy Re-encryption with Chosen-Ciphertext Security

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

Preview

PDF
305Kb

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)
Research Group:	Distributed and Embedded Systems (DIES)
Link to this item:	http://purl.utwente.nl/publications/68365
Official URL:	http://dx.doi.org/10.1007/978-3-642-04474-8_13
Export this item as:	BibTeX EndNote HTML Citation Reference Manager

Show download statistics for this publication

Repository Staff Only: item control page