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Authors: Sam Ng and Tomas Tauber

Affiliation: Crypto.com, Hong Kong and China

Keyword(s): Delegable Undeniable Signature, Designated Confirmer, Blockchain, Privacy.

Related Ontology Subjects/Areas/Topics: Applied Cryptography ; Cryptographic Techniques and Key Management ; Data Engineering ; Databases and Data Security ; Information and Systems Security ; Privacy Enhancing Technologies ; Security Protocols

Abstract: We present the first ECDSA-compatible delegable undeniable signature. Undeniable signature was first introduced by Chaum and Antwerpen. Such signatures cannot be verified without running a zero-knowledge protocol with the signer. Delegable undeniable signature extends this by allowing the signer to delegate the verification ability to a third party. An example use case for delegable undeniable signature is that a trusted party verifies a user’s personal information, signs a message and then passes the signature back to the user. If a verifier needs to know that personal information (e.g. an online merchant selling alcohol needs to verify the user’s age), the user can run the verification protocol as a delegate to prove the trusted party (e.g. the government) signed that personal information. The verifier will be convinced the signature is genuine, but will not be able to convince others. Our signature scheme is based on standard ECDSA, which is the most common signature scheme in blo ckchain technology. It is easy to construct (it involves two standard ECDSA signatures) and easy to verify (a simple two-round zero-knowledge protocol). We believe our signature scheme is useful especially in Self-Sovereign Digital Identity. (More)

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Paper citation in several formats:
Ng, S. and Tauber, T. (2019). ECDSA-compatible Delegable Undeniable Signature. In Proceedings of the 16th International Joint Conference on e-Business and Telecommunications - SECRYPT; ISBN 978-989-758-378-0; ISSN 2184-3236, SciTePress, pages 470-477. DOI: 10.5220/0007949604700477

@conference{secrypt19,
author={Sam Ng. and Tomas Tauber.},
title={ECDSA-compatible Delegable Undeniable Signature},
booktitle={Proceedings of the 16th International Joint Conference on e-Business and Telecommunications - SECRYPT},
year={2019},
pages={470-477},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0007949604700477},
isbn={978-989-758-378-0},
issn={2184-3236},
}

TY - CONF

JO - Proceedings of the 16th International Joint Conference on e-Business and Telecommunications - SECRYPT
TI - ECDSA-compatible Delegable Undeniable Signature
SN - 978-989-758-378-0
IS - 2184-3236
AU - Ng, S.
AU - Tauber, T.
PY - 2019
SP - 470
EP - 477
DO - 10.5220/0007949604700477
PB - SciTePress

- Science and Technology Publications, Lda.
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