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Linkable Attribute-based Signature

Authors: Masip Ardévol, Héctor;

Linkable Attribute-based Signature

Abstract

Attribute-based signatures, as introduced by Maji et al. [MPR11] allow to generate anonymously a signature for a message on behalf of a signing policy. To sign a message, a private attribute that satises the signing policy has to be used. It is furthermore not possible to identify the actual signer based on the signature. Attribute-based signatures have some important properties for electronic voting, e.g., it guarantees that a vote has been submitted by an eligible voter without revealing her identity. To be fully applicable in that setting, attribute-based signatures must allow not only to determine when some signatures have been emitted by the same person, but also it has to easily detect when the signatures have been issued by dierent persons. In this thesis, we solve the aforementioned problems by constructing a linkable attribute-based signature (LABS) scheme for unbounded circuits in the random oracle model. We start by providing a generic construction of LABS schemes, where we dene both the linkability and exculpability properties. We also provide a concrete instantiation of our generic LABS construction from protocols based on lattices. We do it by introducing a new zero-knowledge proof of knowledge for proving possession of a valid signature of the lattice-based signature scheme of Boschini et al. [Bos+20].

Country
Spain
Keywords

E-voting, Àrees temàtiques de la UPC::Matemàtiques i estadística, Post-quantum cryptography, Informàtica--Matemàtica, Cryptography, Lattice, :Matemàtiques i estadística [Àrees temàtiques de la UPC], Digital signature scheme, :68 Computer science::68R Discrete mathematics in relation to computer science [Classificació AMS], Computer science--Mathematics, Classificació AMS::68 Computer science::68R Discrete mathematics in relation to computer science, Attribute-based signature, 004

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selected citations
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This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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