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Published in:
2015 | OriginalPaper | Chapter
Revocable Threshold Attribute-Based Signature against Signing Key Exposure
Authors : Jianghong Wei, Xinyi Huang, Xuexian Hu, Wenfen Liu
Published in: Information Security Practice and Experience
Publisher: Springer International Publishing
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For a cryptosystem with a large number of users, it is necessary to provide an efficient revocation mechanism to preserve the security of whole system. In this paper, we aim to provide a scalable revocation mechanism for attribute-based signature (ABS). Specifically, we first formally define the syntax of revocable ABS (RABS), followed with a corresponding security model that considers a realistic threat called
signing key exposure
. Then, built on the ideas of an ABS scheme and binary data structure, we present a concrete construction of RABS with signing key exposure resistance. Finally, the proposed scheme is proved to be existentially unforgeable under adaptively chosen message attacks in the selective-predicate model, without random oracles. In addition to the necessary revocation functionality, the proposed scheme remains efficient in terms of storage cost and computation complexity.