Zero-Knowledge Age Restriction for GNU Taler

Kesim, Özgür; Grothoff, Christian; Dold, Florian; Schanzenbach, Martin (30 September 2022). Zero-Knowledge Age Restriction for GNU Taler In: 27th European Symposium on Research in Computer Security (ESORICS) 13554 (pp. 110-129). Springer 10.1007/978-3-031-17140-6_6

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We propose a design for a privacy-friendly method of age restriction in e-commerce that is aligned with the principle of subsidiarity. The design is presented as an extension of a privacy-friendly payment protocol with a zero-knowledge scheme that cryprographically augments coins for this purpose. Our scheme enables buyers to prove to be of sufficient age for a particular transaction without disclosing it. Our modification preserves the privacy and security properties of the payment system such as the anonymity of minors as buyers as well as unlinkability of transactions. We show how our scheme can be instantiated with ECDSA as well with a variant of EdDSA, respectively, and how it can be integrated with the GNU Taler payment system. We provide formal proofs and implementation of our proposal. Key performance measurements for various CPU architectures and implementations are presented.

Item Type:	Conference or Workshop Item (Paper)
Division/Institute:	School of Engineering and Computer Science > Institute for Cybersecurity & Engineering (ICE) > ICE / FinTech Security Group School of Engineering and Computer Science
Name:	Kesim, Özgür; Grothoff, Christian; Dold, Florian and Schanzenbach, Martin
Subjects:	Q Science > QA Mathematics Q Science > QA Mathematics > QA76 Computer software
Publisher:	Springer
Funders:	[UNSPECIFIED] NGI POINTER ; [UNSPECIFIED] Taler Systems SA ; [UNSPECIFIED] BMBF
Projects:	[UNSPECIFIED] GNU Taler
Language:	English
Submitter:	Christian Grothoff
Date Deposited:	12 Aug 2022 11:55
Last Modified:	18 Dec 2022 01:36
Publisher DOI:	10.1007/978-3-031-17140-6_6
Related URLs:	Organisation
ARBOR DOI:	10.24451/arbor.17279
URI:	https://arbor.bfh.ch/id/eprint/17279