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<h1>2022-9: "Zero-Knowledge Age Restriction for GNU Taler"</h1>
<h2>Abstract</h2>
<p>
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.
</p>
<h2>Download links</h2>
<ul>
<li><a href="/papers/esorics2022-age-restriction.pdf">PDF (English)</a></li>
<li><a href="/presentations/esorics2022.pdf">PDF of presentation on ESORICS 2022 (English)</a></li>
<li>The paper has been <a href="https://link.springer.com/chapter/10.1007/978-3-031-17140-6_6">published in the proceedings to ESORICS 2022</a></li>
</ul>
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