Title

Efficient Conditional Proxy Re-Encryption with Chosen-Ciphertext Security

Publication Type

Conference Proceeding Article

Publication Date

9-2009

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 re-formalize more rigorous definition and security notions for C-PRE. We further propose a more efficient C-PRE scheme, and prove its chosen-ciphertext 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.

Keywords

Conditional proxy re-encryption, chosen-ciphertext security, random oracle

Discipline

Information Security

Research Areas

Cybersecurity

Publication

Information Security: 12th International Conference, ISC 2009, Pisa, Italy, September 7-9, 2009: Proceedings

Volume

5735

First Page

151

Last Page

166

ISBN

9783642044731

Identifier

10.1007/978-3-642-04474-8_13

Publisher

Springer Verlag

City or Country

Berlin

Additional URL

http://dx.doi.org/10.1007/978-3-642-04474-8_13