Publication Type

Conference Proceeding Article

Version

publishedVersion

Publication Date

10-2021

Abstract

Policy-based chameleon hash (PCH) is a cryptographic building block which finds increasing practical applications. Given a message and an access policy, for any chameleon hash generated by a PCH scheme, a chameleon trapdoor holder whose rewriting privileges satisfy the access policy can amend the underlying message without affecting the hash value. In practice, it is necessary to revoke the rewriting privileges of a trapdoor holder due to various reasons, such as change of positions, compromise of credentials, or malicious behaviours. In this paper, we introduce the notion of revocable PCH (RPCH) and formally define its security. We instantiate a concrete RPCH construction by putting forward a practical revocable attribute-based encryption (RABE) scheme which is adaptively secure under a standard assumption on prime-order pairing groups. As application examples, we show how to effectively integrate RPCH into mutable blockchain and sanitizable signature for revoking the rewriting privileges of any chameleon trapdoor holders. We implement our RPCH scheme and evaluate its performance to demonstrate its efficiency.

Keywords

Policy-based chameleon hash, Revocable attribute-based encryption, Mutable blockchain, Sanitizable signature

Discipline

Information Security

Research Areas

Cybersecurity

Publication

Computer Security: ESORICS 2021: 26th European Symposium on Research in Computer Security, Darmstadt, Germany, October 4-8: Proceedings

Volume

12972

First Page

327

Last Page

347

ISBN

9783030884178

Identifier

10.1007/978-3-030-88418-5_16

Publisher

Springer

City or Country

Cham

Additional URL

https://doi.org/10.1007/978-3-030-88418-5_16

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