Traceable attribute-based signature

Traceable attribute-based signature (TABS) is a useful cryptographic tool to protect the real signers identities while tracing the real signers under some conditions. Traceable attribute-based signature inherits the merits of attribute-based signature, where each signer can sign any messages with fine-grained control over identity information. Since attribute-based signature can hide the identities of real signers to protect their privacy, it can bring about another security issue. For example, some signers abuse attribute-based signatures to sign any messages, and the abusing behaviour cannot be traced. To solve this problem, traceable attribute-based signature is proposed to balance the usage of attribute-based signatures. Traceable attribute-based signature may protect the privacy of real signers, and it may trace the identities of real signers by trusted third party under some conditions. Currently few traceable attribute-based signature schemes are proposed. Escala et al. proposed a traceable attribute-based signature scheme in the standard model, which can trace the identities of real signers. However, their scheme only supports that the attribute predicates are solely conjunction of attributes. Okamoto et al. proposed an attribute-based signature scheme in the standard model, their scheme can support generalized non-monotone predicates. However, their scheme does not have the traceability. In this paper, we present a traceable attribute-based signature scheme for monotone predicates in the standard model. Compared with other traceable attribute-based signature schemes, our proposed scheme is efficient. (C) 2019 Elsevier Ltd. All rights reserved.