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1<!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title> Jiaxin Guan </title> <meta name="author" content="Jiaxin Guan"> <meta name="description" content="Personal wesbite of Jiaxin Guan. "> <meta name="keywords" content="cryptography, bounded-storage-model, theoretical-computer-science, jiaxin-guan, information-theoretic-cryptography"> <link rel="stylesheet" href="/assets/css/bootstrap.min.css?a4b3f509e79c54a512b890d73235ef04"> <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/css/mdb.min.css" integrity="sha256-jpjYvU3G3N6nrrBwXJoVEYI/0zw8htfFnhT9ljN3JJw=" crossorigin="anonymous"> <link defer rel="stylesheet" href="/assets/css/academicons.min.css?f0b7046b84e425c55f3463ac249818f5"> <link defer rel="stylesheet" type="text/css" href="https://fonts.googleapis.com/css?family=Roboto:300,400,500,700|Roboto+Slab:100,300,400,500,700|Material+Icons&amp;display=swap"> <link defer rel="stylesheet" href="/assets/css/jekyll-pygments-themes-github.css?591dab5a4e56573bf4ef7fd332894c99" media="" id="highlight_theme_light"> <link rel="shortcut icon" href="/assets/img/favicon.ico?80e985184e3a1da9d70e2b56a5c9214c"> <link rel="stylesheet" href="/assets/css/main.css?d41d8cd98f00b204e9800998ecf8427e"> <link rel="canonical" href="https://www.guan.io/"> 

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1 </head> <body class="fixed-top-nav "> <header> <nav id="navbar" class="navbar navbar-light navbar-expand-sm fixed-top" role="navigation"> <div class="container"> <button class="navbar-toggler collapsed ml-auto" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation"> <span class="sr-only">Toggle navigation</span> <span class="icon-bar top-bar"></span> <span class="icon-bar middle-bar"></span> <span class="icon-bar bottom-bar"></span> </button> <div class="collapse navbar-collapse text-right" id="navbarNav"> <ul class="navbar-nav ml-auto flex-nowrap"> <li class="nav-item active"> <a class="nav-link" href="/">About <span class="sr-only">(current)</span> </a> </li> <li class="nav-item "> <a class="nav-link" href="/publications/">Publications </a> </li> <li class="nav-item "> <a class="nav-link" href="/teaching/">Teaching </a> </li> <li class="nav-item "> <a class="nav-link" href="/cv/">CV </a> </li> <li class="toggle-container"> <button id="light-toggle" title="Change theme"> <i class="ti ti-moon-filled" id="light-toggle-dark"></i> <i class="ti ti-sun-filled" id="light-toggle-light"></i> </button> </li> </ul> </div> </div> </nav> <progress id="progress" value="0"> <div class="progress-container"> <span class="progress-bar"></span> </div> </progress> </header> <div class="container mt-5" role="main"> <div class="post"> <header class="post-header"> <h1 class="post-title"> Jiaxin Guan | <span class="chinese-text">管佳鑫</span> </h1> <p class="desc">(Theory × Practice) @ Cryptography</p> </header> <article> <div class="profile float-right"> <figure> <picture> <source class="responsive-img-srcset" srcset="/assets/img/profile-480.webp 480w,/assets/img/profile-800.webp 800w,/assets/img/profile-1400.webp 1400w," sizes="(min-width: 930px) 270.0px, (min-width: 576px) 30vw, 95vw" type="image/webp"> <img src="/assets/img/profile.jpg?cf5e826f38b9e82fcbc9cb4ab87e4edd" class="img-fluid z-depth-1 rounded" width="100%" height="auto" alt="profile.jpg" loading="eager" onerror="this.onerror=null; $('.responsive-img-srcset').remove();"> </source></picture> </figure> <div class="more-info" align="center"><p align="center" style="margin-bottom:1em;"><b>jiaxin [at] guan [dot] io</b><br> </p></div> </div> <div class="clearfix"> <p>I am an Applied Cryptographer at <a href="https://www.zellic.io" rel="external nofollow noopener" target="_blank">Zellic</a>, where I audit and conduct research across a wide range of advanced cryptographic systems.</p> <p>My academic research focuses on <strong>the space aspects of cryptography</strong>, exploring scenarios where space is a limited resource for either adversaries or honest users. This includes work on the Bounded Storage Model, incompressible cryptography, streaming functional encryption, and space lower bounds. I am also broadly interested in other topics in theoretical and applied cryptography in general.</p> <p>Previously, I was an Assistant Professor / Faculty Fellow at <a href="https://cs.nyu.edu" rel="external nofollow noopener" target="_blank">New York University</a>, hosted by <a href="https://cs.nyu.edu/~mmb586/index.html" rel="external nofollow noopener" target="_blank">Marshall Ball</a> and <a href="https://cs.nyu.edu/~dodis" rel="external nofollow noopener" target="_blank">Yevgeniy Dodis</a>. I earned my PhD from <a href="https://cs.princeton.edu" rel="external nofollow noopener" target="_blank">Princeton University</a>, where I was fortunate to be advised by <a href="https://mzhandry.github.io" rel="external nofollow noopener" target="_blank">Mark Zhandry</a>. I graduated with a B.S. with Honors and a M.S. from <a href="https://cs.stanford.edu" rel="external nofollow noopener" target="_blank">Stanford University</a>, with <a href="https://crypto.stanford.edu/~dabo" rel="external nofollow noopener" target="_blank">Dan Boneh</a> as my advisor.</p> <p>When I’m not working, I mostly enjoy photography, <a href="https://www.cellunova.org" rel="external nofollow noopener" target="_blank">theater</a>, and cooking.</p> </div> <h2> <a href="/news/" style="color: inherit">News</a> </h2> <div class="news"> <div class="table-responsive" style="max-height: 60vw"> <table class="table table-sm table-borderless"> <tr> <th scope="row" style="width: 20%">Aug 24, 2026</th> <td> Two of my papers, “Multi-Hop Functional Encryption” (joint work with <a href="https://scholar.google.com/citations?user=pUozQ_wAAAAJ" rel="external nofollow noopener" target="_blank">Pratish Datta</a>, <a href="https://alexiskorb.me/" rel="external nofollow noopener" target="_blank">Alexis Korb</a> and <a href="https://web.cs.ucla.edu/~sahai/" rel="external nofollow noopener" target="_blank">Amit Sahai</a>) and “A Complexity Theoretic Approach to Proofs of Space” (joint work with <a href="https://cs.nyu.edu/~mmb586/index.html" rel="external nofollow noopener" target="_blank">Marshall Ball</a>), are to appear at <a href="https://tcc.iacr.org/2026/" rel="external nofollow noopener" target="_blank">TCC 2026</a>. </td> </tr> <tr> <th scope="row" style="width: 20%">Aug 26, 2025</th> <td> Two of my papers, “Adaptively Secure Streaming Functional Encryption” and “(Multi-Input) FE for Randomized Functionalities, Revisited” are appearing at <a href="https://tcc.iacr.org/2025/" rel="external nofollow noopener" target="_blank">TCC 2025</a>. Both are joint work with <a href="https://scholar.google.com/citations?user=pUozQ_wAAAAJ" rel="external nofollow noopener" target="_blank">Pratish Datta</a>, <a href="https://alexiskorb.me/" rel="external nofollow noopener" target="_blank">Alexis Korb</a> and <a href="https://web.cs.ucla.edu/~sahai/" rel="external nofollow noopener" target="_blank">Amit Sahai</a>. </td> </tr> <tr> <th scope="row" style="width: 20%">Jun 16, 2025</th> <td> I am starting my new position as an Applied Cryptographer at <a href="https://www.zellic.io" rel="external nofollow noopener" target="_blank">Zellic</a>. </td> </tr> <tr> <th scope="row" style="width: 20%">Dec 06, 2024</th> <td> My paper “HELP: Everlasting Privacy through Server-Aided Randomness” will be published in the new IACR journal 

1<a href="https://cic.iacr.org/" rel="external nofollow noopener" target="_blank">Communications in Cryptology</a> Volume 1, Issue 4. Joint work with <a href="https://cims.nyu.edu/~dodis/" rel="external nofollow noopener" target="_blank">Yevgeniy Dodis</a>, Peter Hall, and Alison Lin. </td> </tr> <tr> <th scope="row" style="width: 20%">Nov 05, 2024</th> <td> I will serve on the Editorial Board of <a href="https://cic.iacr.org/" rel="external nofollow noopener" target="_blank">IACR Communications in Cryptology 2025</a>. </td> </tr> </table> </div> </div> <div class="social"> <div class="contact-icons"> <a href="/cdn-cgi/l/email-protection#7653403753404f53404753414e53404f534033365340415341435340475340335853404f534030" title="email"><i class="fa-solid fa-envelope"></i></a> <a href="https://orcid.org/0000-0003-1823-8845" title="ORCID" rel="external nofollow noopener" target="_blank"><i class="ai ai-orcid"></i></a> <a href="https://scholar.google.com/citations?user=BiUlDb8AAAAJ" title="Google Scholar" rel="external nofollow noopener" target="_blank"><i class="ai ai-google-scholar"></i></a> <a href="https://dl.acm.org/profile/99660139879/" title="ACM DL" rel="external nofollow noopener" target="_blank"><i class="ai ai-acm"></i></a> <a href="https://github.com/jxguan" title="GitHub" rel="external nofollow noopener" target="_blank"><i class="fa-brands fa-github"></i></a> <a href="https://www.linkedin.com/in/jxguan" title="LinkedIn" rel="external nofollow noopener" target="_blank"><i class="fa-brands fa-linkedin"></i></a> <a href="https://twitter.com/JiaxinGuan" title="X" rel="external nofollow noopener" target="_blank"><i class="fa-brands fa-x-twitter"></i></a> <a href="https://keybase.io/jiaxin" title="Keybase" rel="external nofollow noopener" target="_blank"><i class="fa-brands fa-keybase"></i></a> <a href="https://dblp.org/pid/220/3007.html" title="DBLP" rel="external nofollow noopener" target="_blank"><i class="ai ai-dblp"></i></a> </div> <div class="contact-note"></div> </div> </article> </div> </div> <footer class="fixed-bottom" role="contentinfo"> <div class="container mt-0"> © Copyright 2026 Jiaxin Guan. Powered by <a href="https://jekyllrb.com/" target="_blank" rel="external nofollow noopener">Jekyll</a> with <a href="https://github.com/alshedivat/al-folio" rel="external nofollow noopener" target="_blank">al-folio</a> theme. Hosted by <a href="https://pages.github.com/" target="_blank" rel="external nofollow noopener">GitHub Pages</a>. Last updated: August 24, 2026. </div> </footer>

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