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<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta name="viewport" content="width=device-width"/><title>Dan Ristea - Doctoral Researcher at UCL</title><link rel="icon" href="/favicon.ico"/><meta name="description" content="Dri.st: Academic website of Dan Ristea - Doctoral Researcher at UCL - which offers an overview of my research interests and PhD research"/><meta http-equiv="content-language" content="en-gb"/><link rel="canonical" href="https://dri.st/"/><meta name="next-head-count" content="7"/><link rel="preload" href="/_next/static/css/d64599caac2d76f7.css" as="style" crossorigin=""/><link rel="stylesheet" href="/_next/static/css/d64599caac2d76f7.css" crossorigin="" data-n-g=""/><noscript data-n-css=""></noscript></head><body><div id="__next"><main class="Container_Container__L_q4N"><header class="Menu_Menu___eH7_"><div class="Menu_Menu__cover__mN2aM" title="The foggy forest background is meant to be a metaphor: differential privacy hides individuals' data in summary data by perturbing the output, just like the fog obscures our view of individual trees in the forest."><div class="Menu_Menu__body__KO6rL"><a href="/"><a class="Menu_Menu__link__OitF1" title="Home"><span class="Menu_Menu__title__UJf5I">Dan Ristea</span><span class="Menu_Menu__subtitle__L4D_2">[REES-teah; IPA: 'ris-t<!-- -->e̯<!-- -->a]</span></a></a><div class="Menu_Menu__links__c5Qj2"><a href="/#about"><a class="Menu_Menu__link__OitF1" title="About">About</a></a><a href="/#publications"><a class="Menu_Menu__link__OitF1" title="Publications">Publications</a></a><a href="/#teaching"><a class="Menu_Menu__link__OitF1" title="Teaching">Teaching</a></a><a href="/#contact"><a class="Menu_Menu__link__OitF1" title="Contact">Contact</a></a></div><div class="Menu_Menu__socials__4Khaa"><a class="Menu_Menu__link__OitF1" href="https://github.com/danrr/" target="_blank" rel="noreferrer" aria-label="GitHub"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 496 512" role="img" class="Menu_Menu__button__Gup34"><title>Github</title><path d="M165.9 397.4c0 2-2.3 3.6-5.2 3.6-3.3.3-5.6-1.3-5.6-3.6 0-2 2.3-3.6 5.2-3.6 3-.3 5.6 1.3 5.6 3.6zm-31.1-4.5c-.7 2 1.3 4.3 4.3 4.9 2.6 1 5.6 0 6.2-2s-1.3-4.3-4.3-5.2c-2.6-.7-5.5.3-6.2 2.3zm44.2-1.7c-2.9.7-4.9 2.6-4.6 4.9.3 2 2.9 3.3 5.9 2.6 2.9-.7 4.9-2.6 4.6-4.6-.3-1.9-3-3.2-5.9-2.9zM244.8 8C106.1 8 0 113.3 0 252c0 110.9 69.8 205.8 169.5 239.2 12.8 2.3 17.3-5.6 17.3-12.1 0-6.2-.3-40.4-.3-61.4 0 0-70 15-84.7-29.8 0 0-11.4-29.1-27.8-36.6 0 0-22.9-15.7 1.6-15.4 0 0 24.9 2 38.6 25.8 21.9 38.6 58.6 27.5 72.9 20.9 2.3-16 8.8-27.1 16-33.7-55.9-6.2-112.3-14.3-112.3-110.5 0-27.5 7.6-41.3 23.6-58.9-2.6-6.5-11.1-33.3 2.6-67.9 20.9-6.5 69 27 69 27 20-5.6 41.5-8.5 62.8-8.5s42.8 2.9 62.8 8.5c0 0 48.1-33.6 69-27 13.7 34.7 5.2 61.4 2.6 67.9 16 17.7 25.8 31.5 25.8 58.9 0 96.5-58.9 104.2-114.8 110.5 9.2 7.9 17 22.9 17 46.4 0 33.7-.3 75.4-.3 83.6 0 6.5 4.6 14.4 17.3 12.1C428.2 457.8 496 362.9 496 252 496 113.3 383.5 8 244.8 8zM97.2 352.9c-1.3 1-1 3.3.7 5.2 1.6 1.6 3.9 2.3 5.2 1 1.3-1 1-3.3-.7-5.2-1.6-1.6-3.9-2.3-5.2-1zm-10.8-8.1c-.7 1.3.3 2.9 2.3 3.9 1.6 1 3.6.7 4.3-.7.7-1.3-.3-2.9-2.3-3.9-2-.6-3.6-.3-4.3.7zm32.4 35.6c-1.6 1.3-1 4.3 1.3 6.2 2.3 2.3 5.2 2.6 6.5 1 1.3-1.3.7-4.3-1.3-6.2-2.2-2.3-5.2-2.6-6.5-1zm-11.4-14.7c-1.6 1-1.6 3.6 0 5.9 1.6 2.3 4.3 3.3 5.6 2.3 1.6-1.3 1.6-3.9 0-6.2-1.4-2.3-4-3.3-5.6-2z"></path></svg></a><a class="Menu_Menu__link__OitF1" href="https://www.linkedin.com/in/dan-ristea" target="_blank" rel="noreferrer" aria-label="LinkedIn"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512" role="img" class="Menu_Menu__button__Gup34"><title>LinkedIn</title><path d="M416 32H31.9C14.3 32 0 46.5 0 64.3v383.4C0 465.5 14.3 480 31.9 480H416c17.6 0 32-14.5 32-32.3V64.3c0-17.8-14.4-32.3-32-32.3zM135.4 416H69V202.2h66.5V416zm-33.2-243c-21.3 0-38.5-17.3-38.5-38.5S80.9 96 102.2 96c21.2 0 38.5 17.3 38.5 38.5 0 21.3-17.2 38.5-38.5 38.5zm282.1 243h-66.4V312c0-24.8-.5-56.7-34.5-56.7-34.6 0-39.9 27-39.9 54.9V416h-66.4V202.2h63.7v29.2h.9c8.9-16.8 30.6-34.5 62.9-34.5 67.2 0 79.7 44.3 79.7 101.9V416z"></path></svg></a></div></div></div></header><main class="Main_Main__miiEY"><h1>Dan Ristea</h1><h2 id="#about"> About</h2><p>I am a PhD student in the<!-- --> <a href="https://www.ucl.ac.uk/cybersecurity-cdt/">Centre for Doctoral Training in Cybersecurity</a> <!-- -->at University College London. My research interest is differential privacy, specifically how it is verified and validated in real-world use-cases. My supervisor is<!-- --> <a href="https://murdoch.is/#contact">Professor Steven J. Murdoch</a>.</p><h2 id="#publications"> Publications</h2><h3>CoStricTor: Collaborative HTTP Strict Transport Security in Tor Browser</h3><p>Killian Davitt, Dan Ristea, Duncan Russell, Steven J. Murdoch</p><a href="https://doi.org/10.56553/popets-2024-0020">PoPETS 2024, Issue 1</a><details><summary>Abstract:</summary><p>HTTP Strict Transport Security (HSTS) is a widely-deployed security feature in modern web browsing. It is also, however, a potential vector for user tracking and surveillance. Tor Browser, a web browser primarily concerned with online anonymity, disables HSTS as a result of this tracking potential. We present the CoStricTor protocol which crowdsources HSTS data among Tor Browser clients. It gives Tor Browser users increased resistance to man-in-the-middle attacks without exposing them to HSTS tracking. Our protocol adapts other privacy-preserving data aggregation algorithms to share data effectively among users with strong local differential privacy guarantees. The CoStricTor protocol resists denial of service attacks by design through our innovative use of Bloom filters to represent complementary data. Our simulations show our protocol can model up to 150,000 websites, providing 10,000 upgrades to HSTS for users.</p></details><h2 id="#teaching">Teaching</h2><p>I am currently a Postgraduate Teaching Assistant for the following Masters-level modules at UCL:</p><ul><li><p><a href="https://www.ucl.ac.uk/module-catalogue/modules/introduction-to-cryptography/COMP0025">COMP0025 - Introduction to Cryptography</a> <!-- -->(term 1 - 2021/2022, 2022/2023, 2023/2024).</p><p>I ran tutorial sessions, contributed material to homework and coursework assignments, and marked assignments</p></li><li><p><a href="https://www.ucl.ac.uk/module-catalogue/modules/privacy-enhancing-technologies-COMP0061">COMP0061 - Privacy Enhancing Technologies</a> <!-- -->(term 2 - 2021/2022, 2022/2023, 2023/2024)</p><p>I automated lab assignments using GitHub Classroom, provided technical assistance to students with lab assignments, guided discussions in seminars, and marked lab assignments.</p></li><li>For my teaching activity as a PGTA, I was awarded the<!-- --> <a href="Education_award.pdf">UCL Education Award for top Postgraduate Teaching Assistant in the Faculty of Engineering Sciences</a> <!-- -->for the 2021/2022 academic year.<!-- --> <a href="https://www.ucl.ac.uk/computer-science/news/2022/may/computer-science-postgraduate-teaching-assistant-nominated-ucl-education-award">UCL Blog</a></li></ul><p>I am also a React coach for<!-- --> <a href="https://skillerwhale.com/">Skiller Whale</a>.</p><h2 id="#contact">Contact</h2><p>Email: dan at dri.st</p> </main></main></div></body></html>