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<!DOCTYPE html>
<html lang="en-us">
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<meta charset="UTF-8">
<title>Bogdan Ursu</title>
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<section class="page-header">
<h1 class="project-name"><font size="6"></font></h1>
<h2 class="project-tagline"></h2>
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<section class="main-content">
<h2>
<a id="about-me" class="anchor" href="#about-me" aria-hidden="true"><span aria-hidden="true" class="octicon octicon-link"></span></a>Bogdan Ursu</h2>
<p><!--<img style="position: relative;left: -36px;" src="https://bogdanbear.github.io/resources/cvcachan.png" alt="Me" width="200" height="200" align="left">-->
Hi! I am a researcher in cryptography at Consensys, where I work on efficient arguments of knowledge. In Spring 2023, I obtained my PhD in Computer Science from ETH Zurich, under the supervision of Prof. Dennis Hofheinz. During my PhD, my main research interests were at the intersection between zero-knowledge, functional encryption and indistinguishability obfuscation.</p>
<p><strong><code>bogdanursuoffice AT gmail.com</code></strong></p>
<ul>
<li><p> Doctorate in Computer Science - <a href="http://foc.ethz.ch"><strong><code>ETH Zurich</code></strong></a>.</li>
<li><p> <a href="https://wikimpri.dptinfo.ens-cachan.fr/doku.php">Parisian Master of Research in Computer Science</a> - <a href="https://ens-paris-saclay.fr/en/"><strong><code>École Normale Supérieure Paris-Saclay</code></strong></a>.</li>
<!--<li><p>In my second year of master, I have prepared a thesis on functional encryption under the supervision of Dr. Michel Abdalla, at the <a href="https://crypto.di.ens.fr/web2py"><strong><code>ENS Crypto Team</code></strong></a>. For my first year of master, I worked on a project on shortest vector problem solvers, carried out under the supervision of Prof. Serge Vaudenay, at the <a href="http://lasec.epfl.ch/"><strong><code>EPFL</code></strong></a>. </p></li>-->
<li><p>Bachelor of Computer Science - <a href="https://www.uaic.ro/en/"><strong><code>University Alexandru Ioan Cuza of Iasi</code></strong></a>.</p></li>
<!--<li><p>As an undergraduate, I have followed the <a href="http://cybersecurity.imag.fr/">research master in cryptography</a> at <strong><code>Université Joseph-Fourier</code></strong>, most notably the courses on elliptic and hyperelliptic curve cryptography taught by Ms. Vanessa Vitse. </p></li>-->
</ul>
<hr>
<h2><a id="publications" class="anchor" href="#publications" aria-hidden="true"><span aria-hidden="true" class="octicon octicon-link"></span></a>Publications</h2>
<ul>
<li><p> Romain Gay, Bogdan Ursu, <a href="https://eprint.iacr.org/2023/1818">On Instantiating Unleveled Fully-Homomorphic Signatures from Falsifiable Assumptions</a>, PKC 2024 </p></li>
</ul>
<ul>
<li><p> Dennis Hofheinz, Kristina Hostakova, Roman Langrehr, Bogdan Ursu, <a href="https://eprint.iacr.org/2022/1545">On Structure-Preserving Cryptography and Lattices</a>, PKC 2024 </p></li>
</ul>
<ul>
<li><p> Geoffroy Couteau, Shuichi Katsumata, Elahe Sadeghi, Bogdan Ursu, <a href="https://eprint.iacr.org/2021/688">Statistical ZAPs from Group-Based Assumptions</a>, TCC 2021 </p></li>
</ul>
<ul>
<li><p> Nico Döttling, Dominik Hartmann, Dennis Hofheinz, Eike Kiltz, Sven Schäge, Bogdan Ursu, <a href="https://eprint.iacr.org/2021/738">On the Impossibility of Short Algebraic Signatures</a>, TCC 2021 </p></li>
</ul>
<ul>
<li><p> Michel Abdalla, Dario Catalano, Romain Gay, Bogdan Ursu, <a href="https://eprint.iacr.org/2020/577">Inner-Product Functional Encryption with Fine-Grained Access Control</a>, Asiacrypt 2020 </p></li>
</ul>
<ul>
<li><p> Geoffroy Couteau, Shuichi Katsumata, Bogdan Ursu, <a href="https://eprint.iacr.org/2020/535">Non-Interactive Zero-Knowledge in Pairing-Free Groups from Weaker Assumptions</a>, Eurocrypt 2020 </p></li>
</ul>
<ul>
<li><p> Dennis Hofheinz, Bogdan Ursu, <a href="https://eprint.iacr.org/2019/475">Dual-Mode NIZKs from Obfuscation</a>, Asiacrypt 2019 </p></li>
</ul>
<ul>
<li><p> Michel Abdalla, Dario Catalano, Dario Fiore, Romain Gay, Bogdan Ursu, <a href="https://eprint.iacr.org/2017/972">Multi-Input Functional Encryption for Inner Products: Function-Hiding Realizations and Constructions without Pairings</a>, Crypto 2018 </p></li>
</ul>
<h2><a id="preprints" class="anchor" href="#preprints" aria-hidden="true"><span aria-hidden="true" class="octicon octicon-link"></span></a>Preprints</h2>
<ul>
<li><p>Alexandre Belling, Azam Soleimanian, Bogdan Ursu, <a href="https://eprint.iacr.org/2024/185.pdf">Vortex: A List Polynomial Commitment and its Application to Arguments of Knowledge</a>, Preprint 2024</p></li>
</ul>
<h2><a id="thesis" class="anchor" href="#thesis" aria-hidden="true"><span aria-hidden="true" class="octicon octicon-link"></span></a>Doctoral Thesis</h2>
<ul>
<li><p>Bogdan Ursu, <a href="https://www.research-collection.ethz.ch/handle/20.500.11850/635023">New Constructions of Round-Efficient Zero-Knowledge Proofs</a>, ETH Zurich Online Library 2023</p></li>
</ul>
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