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Efficient Distributed tag-based encryption and its application to group signatures with efficient distributed traceability

Ghadafi, Essam

Efficient Distributed tag-based encryption and its application to group signatures with efficient distributed traceability Thumbnail


Authors

Essam Ghadafi Essam.Ghadafi@uwe.ac.uk
Senior Lecturer in Computer Science



Abstract

© Springer International Publishing Switzerland 2015. In this work, we first formalize the notion of dynamic group signatures with distributed traceability, where the capability to trace signatures is distributed among n managers without requiring any interaction. This ensures that only the participation of all tracing managers permits tracing a signature, which reduces the trust placed in a single tracing manager. The threshold variant follows easily from our definitions and constructions. Our model offers strong security requirements. Our second contribution is a generic construction for the notion which has a concurrent join protocol, meets strong security requirements, and offers efficient traceability, i.e. without requiring tracing managers to produce expensive zero-knowledge proofs for tracing correctness. To dispense with the expensive zero-knowledge proofs required in the tracing, we deploy a distributed tag-based encryption with public verifiability. Finally, we provide some concrete instantiations, which, to the best of our knowledge, are the first efficient provably secure realizations in the standard model simultaneously offering all the aforementioned properties. To realize our constructions efficiently, we construct an efficient distributed (and threshold) tag-based encryption scheme that works in the efficient Type-III asymmetric bilinear groups. Our distributed tag-based encryption scheme yields short ciphertexts (only 1280 bits at 128-bit security), and is secure under an existing variant of the standard decisional linear assumption. Our tag-based encryption scheme is of independent interest and is useful for many applications beyond the scope of this paper. As a special case of our distributed tag-based encryption scheme, we get an efficient tag-based encryption scheme in Type-III asymmetric bilinear groups that is secure in the standard model.

Citation

Ghadafi, E. (2015). Efficient Distributed tag-based encryption and its application to group signatures with efficient distributed traceability. Lecture Notes in Artificial Intelligence, 8895, 327-347. https://doi.org/10.1007/978-3-319-16295-9_18

Journal Article Type Conference Paper
Acceptance Date Sep 1, 2014
Publication Date Jan 1, 2015
Publicly Available Date Jun 6, 2019
Journal Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Print ISSN 0302-9743
Electronic ISSN 1611-3349
Publisher Springer Verlag
Peer Reviewed Peer Reviewed
Volume 8895
Pages 327-347
Book Title Progress in Cryptology - LATINCRYPT 2014
DOI https://doi.org/10.1007/978-3-319-16295-9_18
Keywords group signatures, distributed traceability, distributed public-key encryption, standard model
Public URL https://uwe-repository.worktribe.com/output/836970
Publisher URL http://dx.doi.org/10.1007/978-3-319-16295-9_18

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