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<html lang="en">
<head>
<title>Block CTF: hacking competition!</title>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="shortcut icon" type="image/x-icon" href="favicon.ico">
<meta name="og:title" content="Square CTF: hacking competition!">
<meta name="og:url" content="https://squarectf.com/">
<meta property="og:type" content="website">
<meta name="og:description" content="Compete to solve security-related challenges.">
<meta property="og:image" content="/og.png">
<meta name="twitter:card" content="summary">
<meta name="twitter:site" content="@SquareEng">
<meta name="twitter:title" content="Square CTF: We make security and hacking more approachable — since 2014.">
<meta name="twitter:description" content="Compete to solve security-related challenges.">
<meta name="twitter:image" content="/og.png">
<meta name="description" content="Compete to solve security-related challenges.">
<meta name="author" content="Square, Inc.">
<link rel="stylesheet" media="screen" href="squarectf.css">
</head>
<body>
<div class="wideline begin">
<span>Block_CTF(1)</span>
<span><a href="index.html"><img src="https://storage.googleapis.com/square-console-production/assets/2380a284d3e59ed8449cdf60c66972abd30d4e1ad24968b4b9f2ad7596f6cc0d4cf5456b67f255ab3231f6f6410be02b527325b4373237e7697e84e221faeaeb.png"></a></span>
<span>Block_CTF(1)</span>
</div>
<h1>Name</h1>
<p>BlockCTF - Capture the Flag competitions, hosted by Block, where teams compete to solve security-related challenges for points.</p>
<h1>New to CTFs?</h1>
<p>Our CTFs are meant to be fun for both first time and experienced players. We
create an assortment of easy, medium, and hard puzzles.</p>
<p>We aspire to create a few novel puzzles, putting everyone on the same level.</p>
<p>We have a <a href="tips.html">list of tips</a> that should help you get started. Some of our previous years'
challenges and their solutions are made available to you. You are <a href="https://creativecommons.org/licenses/by/4.0/">free to use</a>
the content on this site as you please — you may even flatter us by copying bits and pieces for your own event!</p>
<h1>Events</h1>
<ul>
<li>2024: 13 Nov. 22:00 UTC — 14 Nov. 22:00 UTC. <a href="https://2024.blockctf.com">Register here!</a></li>
<li>2023: <a href="2023/index.html">challenges, writeups and results</a></li>
<li>2022: <a href="2022/index.html">challenges, writeups and results</a></li>
<li>2021: <a href="2021/index.html">challenges, writeups and results</a></li>
<li>2020: <a href="2020/index.html">challenges, writeups and results</a></li>
<li>2019: <a href="2019/index.html">challenges, writeups and results</a></li>
<li>2018: <a href="2018/index.html">challenges, writeups and results</a></li>
<li>2017: <a href="2017/index.html">challenges, writeups and results</a></li>
<li>2016: Slack bots have gained self awareness and are reading the news (private event).</li>
<li>2015: BrewBOT (private event).</li>
<li>2014: <a href="https://microcorruption.com/">Microcorruption: Embedded Security CTF</a> (co-organized) | <a href="http://ghettohaxxx-blog.azurewebsites.net/microcorruption-ctf-writeup/">write up</a>.</li>
</ul>
<h1>Contact</h1>
<ul>
<li>ctf-help@squareup.com</li>
<li>Join our <a href="https://discord.com/invite/Syv9gJ4n3m">BlockCTF Discord server!</a></li>
</ul>
<h1>Credits</h1>
<p>Our CTFs have been possible thanks to Square engineers contributing their
time, skills and energy. Every year, about a dozen engineers get together to build puzzles, as well as spin up
all the infrastructure needed to run a smooth competition. We hope you find these puzzles fun and educational,
we definitely enjoy making them!</p>
<ul>
<li>Mat Byczkowski: Puzzles (2019)</li>
<li>Paras Chetal: Puzzles (2023)</li>
<li>Leon Chou: Puzzles & Infrastructure (2020)</li>
<li>Peter Collins: Infrastructure & puzzles (2017)</li>
<li>Manoj Dayaram: Infrastructure (2017)</li>
<li>Alex Epifano (2021)</li>
<li>Stefan Filipek: Puzzles & Infrastructure (2023)</li>
<li>Kyle Fox:
<div>Organizer (2020, 2021, 2022, 2023)</div>
<div>Puzzles & Infrastructure (2018, 2020, 2021, 2022, 2023)</div>
</li>
<li>Davis Gallinghouse: Puzzles (2015, 2016)</li>
<li>Daniel Ge: Infrastructure (2018)</li>
<li>Ross Glashan: Puzzles (2017, 2018)</li>
<li>Alex Hanlon: Puzzles (2022, 2023)</li>
<li>Sarah Harvey: Chief CTF Officer (2017)</li>
<li>Adam Jimenez: Puzzles (2020, 2023)</li>
<li>Bart Kosciarz: Puzzles (2023)</li>
<li>John Lewis: Creative writing (2015, 2016)</li>
<li>Aaron Lindsey: Puzzles & Infrastructure (2022, 2023)</li>
<li>Kent Ma: Puzzles & Infrastructure (2022, 2023)</li>
<li>Jack Maginnes: Puzzles (2022)</li>
<li>Will McChesney: Puzzles (2017)</li>
<li>Matthew McPherrin: Prizes & puzzles (2016, 2017)</li>
<li>Jordan Mecom: Puzzles 2017 (2018)</li>
<li><a href="https://www.quaxio.com/">Alok Menghrajani</a>:
<div>Organizer (2015, 2016, 2017, 2018, 2019)</div>
<div>Puzzles (2015, 2016, 2017, 2018, 2019, 2022)</div>
</li>
<li>Dan Moore: Puzzles & Infrastructure (2022)</li>
<li>Murtaza Munaim: Puzzles (2017)</li>
<li>Jesse Peirce: Workshop & creative writing (2017, 2018)</li>
<li>Ford Peprah: Puzzles (2018)</li>
<li>Achintya Prakash: Infrastructure & puzzles (2018, 2019)</li>
<li>Alyssa Ransbury: Puzzles (2019)</li>
<li>Mathew Rowley: Puzzles (2017)</li>
<li>Isaac Semaya: Puzzles (2020, 2021)</li>
<li>Jay Smith: Puzzles (2021)</li>
<li>Salvatore Testa: Puzzles & creative writing (2017, 2019)</li>
<li>Alice Wang: Puzzles (2017, 2018)</li>
<li>Brian Wang: Puzzles (2017)</li>
<li>Jared Windover: Design (2018)</li>
<li>Roy Xu: Puzzles (2019, 2020, 2021)</li>
<li>Bushi Zhang: Art work (2019)</li>
<li>Chaoshun Zuo: Puzzles (2023)</li>
</ul>
<p>+ everyone who has helped us in various ways. Including making sure our puzzles are solvable, publicizing our
events and helping out with last minute show stoppers.</p>
<p>We are also thankful to everyone who took the time to publish writeups/solutions!</p>
<h1>See also</h1>
<p>
<a href="https://block.xyz/careers">Work_at_Block(1)</a>,
<a href="https://squareup.com/legal/privacy">Privacy_policy(1)</a>,
<a href="code_of_conduct.html">Code_of_conduct(1)</a>
</p>
<div class="wideline end">
<span>Block, Inc.</span>
<span>(c) <script>
document.write(new Date().toLocaleString("en-us", {
month: "long",
year: "numeric"
}));
</script></span>
<span>Block_CTF(1)</span>
</div>
</body>
</html>