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Group Signatures without NIZK: From Lattices in the Standard Model
Group signatures Lattices Attribute-based signatures
2019/2/28
In a group signature scheme, users can anonymously sign messages on behalf of the group they belong to, yet it is possible to trace the signer when needed. Since the first proposal of lattice-based gr...
Practical Group-Signatures with Privacy-Friendly Openings
public-key cryptography Privacy-Friendly Openings
2019/1/29
Group signatures allow creating signatures on behalf of a group, while remaining anonymous. To prevent misuse, there exists a designated entity, named the opener, which can revoke anonymity by generat...
Group signatures allow members of a group to anonymously produce signatures on behalf of the group. They are an important building block for privacy-enhancing applications, e.g., enabling user data to...
Group signatures present a trade-off between the traditional goals of digital signatures and the signer's desire for privacy, allowing for the creation of unforgeable signatures in the name of a group...
Floppy-Sized Group Signatures from Lattices
Lattices Group Signature Verifiable Encryption
2018/5/22
We present the first lattice-based group signature scheme whose cryptographic artifacts are of size small enough to be usable in practice: for a group of 225225 users, signatures take 910 kB and publi...
Post-Quantum Group Signatures from Symmetric Primitives
Post-Quantum Group Signatures Symmetric Primitives
2018/3/12
Group signatures are used extensively for privacy in anonymous credentials schemes and in real-world systems for hardware enclave attestation. As such, there is a strong interest in making these schem...
Constant-size Group Signatures from Lattices
lattice-based cryptography constant-size group signatures zero-knowledge proofs
2018/1/11
Lattice-based group signature is an active research topic in recent years. Since the pioneering work by Gordon, Katz and Vaikuntanathan (Asiacrypt 2010), ten other schemes have been proposed, providin...
Lattice-Based Group Signatures: Achieving Full Dynamicity with Ease
lattice-based group signatures full dynamicity updatable Merkle trees
2017/4/27
Lattice-based group signature is an active research topic in recent years. Since the pioneering work by Gordon, Katz and Vaikuntanathan (Asiacrypt 2010), eight other schemes have been proposed, provid...
Group Signatures with Linking-Based Revocation: A Pragmatic Approach for Efficient Revocation Checks
Group signatures controllable linkability linking-based revocation
2016/12/7
Group signatures represent an important mechanism for privacy-preserving applications. However, their practical applicability is restricted due to inefficiencies of existing membership revocation mech...
Group signatures are a central cryptographic primitive that
has received a considerable amount of attention from the cryptographic
community. They allow members of a group to anonymously sign on beh...
Non-Interactive Plaintext (In-)Equality Proofs and Group Signatures with Verifiable Controllable Linkability
group signatures verifiable controllable linkability non-interactive plaintext (in-)equality proofs
2016/2/23
Group signatures are an important privacy-enhancing tool
that allow to anonymously sign messages on behalf of a group. A recent
feature for group signatures is controllable linkability, where a dedi...
Signature Schemes with Efficient Protocols and Dynamic Group Signatures from Lattice Assumptions
Lattice-based cryptography anonymity signatures with efficient protocols
2016/2/23
A recent line of works – initiated by Gordon, Katz and Vaikuntanathan
(Asiacrypt 2010) – gave lattice-based constructions allowing
users to authenticate while remaining hidden in a crowd. Despite fi...
Fully-Anonymous Short Dynamic Group Signatures Without Encryption
group signatures BSZ model CCA2-full anonymity
2016/2/23
Group signatures are an important privacy-enhancing tool which allow members
of a group to anonymously produce signatures on behalf of the group. Ideally, group
signatures are dynamic and thus allow...
Group signatures, which allow users of a group to anonymously produce signatures on
behalf of the group, are an important cryptographic primitive for privacy-enhancing applications.
Over the years, ...
Efficient Distributed Tag-Based Encryption and its Application to Group Signatures with Efficient Distributed Traceability
Group signatures distributed traceability distributed public-key encryption
2016/1/6
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 i...