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Stronger security notions for decentralized traceable attribute-based signatures and more efficient constructions

Ghadafi, Essam


Essam Ghadafi
Senior Lecturer in Computer Science


We revisit the notion of Decentralized Traceable Attribute-Based Signatures (DTABS) introduced by El Kaafarani et al. (CT-RSA 2014) and improve the state-of-the-art in three dimensions: Firstly, we provide a new stronger security model which circumvents some shortcomings in existing models. Our model minimizes the trust placed in attribute authorities and hence provides, among other things, a stronger definition for non-frameability. In addition, our model captures the notion of tracing soundness which is important for many applications of the primitive. Secondly, we provide a generic construction that is secure w.r.t. our strong security model and show two example instantiations in the standard model which are more efficient than existing constructions (secure under weaker security definitions). Finally, we dispense with the need for the expensive zero-knowledge proofs required for proving tracing correctness by the tracing authority. As a result, tracing a signature in our constructions is significantly more efficient than existing constructions, both in terms of the size of the tracing proof and the computational cost required to generate and verify it. For instance, verifying tracing correctness in our constructions requires only 4 pairings compared to 34 pairings in the most efficient existing construction.


Ghadafi, E. (2015). Stronger security notions for decentralized traceable attribute-based signatures and more efficient constructions. Lecture Notes in Artificial Intelligence, 9048, 391-409.

Journal Article Type Article
Acceptance Date Mar 11, 2015
Publication Date Mar 11, 2015
Journal Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Print ISSN 0302-9743
Publisher Springer Verlag
Peer Reviewed Peer Reviewed
Volume 9048
Pages 391-409
Book Title Topics in Cryptology –- CT-RSA 2015
Keywords attribute-based signatures, security definitions, traceability, standard model
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