Publication Type

Conference Proceeding Article

Version

publishedVersion

Publication Date

7-2017

Abstract

Identity-based encryption (IBE) has been extensively studied and widely used in various applications since Boneh and Franklin proposed the first practical scheme based on pairing. In that seminal work, it has also been pointed out that providing an efficient revocation mechanism for IBE is essential. Hence, revocable identity-based encryption (RIBE) has been proposed in the literature to offer an efficient revocation mechanism. In contrast to revocation, another issue that will also occur in practice is to combine two or multiple IBE systems into one system, e.g., due to the merge of the departments or companies. However, this issue has not been formally studied in the literature and the naive solution of creating a completely new system is inefficient. In order to efficiently address this problem, in this paper we propose the notion of mergeable and revocable identity-based encryption (MRIBE). Our scheme provides the first solution to efficiently revoke users and merge multiple IBE systems into a single system. The proposed scheme also has several nice features: when two systems are merged, there is no secure channel needed for the purpose of updating user private keys; and the size of the user private key remains unchanged when multiple systems are merged. We also propose a new security model for MRIBE, which is an extension of the security model for RIBE, and prove that the proposed scheme is semantically secure without random oracles.

Keywords

Identity-based encryption, Revocation, Merging

Discipline

Information Security | Software Engineering

Publication

Proceedings of the 22nd Australasian Conference, ACISP 2017 Auckland, New Zealand, July 3–5

Volume

10342

First Page

147

Last Page

167

ISBN

9783319600543

Identifier

10.1007/978-3-319-60055-0_8

Publisher

Springer Link

City or Country

Auckland, New Zealand

Additional URL

https://doi.org/10.1007/978-3-319-60055-0_8

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