Outputs (26)

How low can you go? Short structure-preserving signatures for Diffie-Hellman vectors (2017)
Book Chapter

Structure-Preserving Signatures (SPSs) are an important tool for the design of modular cryptographic protocols.
It has been proven that such schemes in the most efficient Type-3 bilinear group setting have a lower bound of 3-element signatures, wh... Read More about How low can you go? Short structure-preserving signatures for Diffie-Hellman vectors.

More efficient structure-preserving signatures - or: Bypassing the type-III lower bounds (2017)
Presentation / Conference Contribution

© 2017, Springer International Publishing AG. Structure-Preserving Signatures (SPSs) are an important cryptographic primitive that is useful for the design of modular cryptographic protocols. It has be shown that in the most efficient Type-III biline... Read More about More efficient structure-preserving signatures - or: Bypassing the type-III lower bounds.

Efficient round-optimal blind signatures in the standard model (2017)
Book Chapter

Blind signatures are at the core of e-cash systems and has numerous other applications. In this work we construct efficient blind and partially blind signature schemes over bilinear groups in the standard model. Our schemes yield short signatures co... Read More about Efficient round-optimal blind signatures in the standard model.

Foundations of fully dynamic group signatures (2016)
Presentation / Conference Contribution

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 behalf of the group. Membership is overseen by a design... Read More about Foundations of fully dynamic group signatures.

Short accountable ring signatures based on DDH (2016)
Presentation / Conference Contribution

Ring signatures and group signatures are prominent cryptographic primitives offering a combination of privacy and authentication. They enable individual users to anonymously sign messages on behalf of a group of users. In ring signatures, the group,... Read More about Short accountable ring signatures based on DDH.

Short structure-preserving signatures (2016)
Presentation / Conference Contribution

© Springer International Publishing Switzerland 2016. We construct a new structure-preserving signature scheme in the efficient Type-III asymmetric bilinear group setting with signatures shorter than all existing schemes. Our signatures consist of 3... Read More about Short structure-preserving signatures.

Efficient Distributed tag-based encryption and its application to group signatures with efficient distributed traceability (2015)
Presentation / Conference Contribution

© 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 an... Read More about Efficient Distributed tag-based encryption and its application to group signatures with efficient distributed traceability.

Stronger security notions for decentralized traceable attribute-based signatures and more efficient constructions (2015)
Presentation / Conference Contribution

© Springer International Publishing Switzerland 2015. 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,... Read More about Stronger security notions for decentralized traceable attribute-based signatures and more efficient constructions.

Attribute-based signatures with user-controlled linkability (2014)
Presentation / Conference Contribution

In this paper, we introduce Attribute-Based Signatures with User-Controlled Linkability (ABS-UCL). Attribute-based signatures allow a signer who has enough credentials/attributes to anonymously sign a message w.r.t. some public policy revealing neith... Read More about Attribute-based signatures with user-controlled linkability.

Decentralized traceable attribute-based signatures (2014)
Presentation / Conference Contribution

We provide a formal security model for traceable attribute-based signatures. Our focus is on the more practical case where attribute management is distributed among different authorities rather than relying on a single central authority. By specializ... Read More about Decentralized traceable attribute-based signatures.