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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8"/>
<title>
Challenges : IrisCTF 2023 - CTF fun for hackers of all skill levels
</title>
<meta content="A fun, lighthearted, and educational 48-hour online CTF aimed towards hackers of all levels. Takes place the first full Friday-to-Sunday weekend every year." name="description"/>
<meta content="" name="author"/>
<meta content="/static/img/favicon.png" property="og:image">
<link href="/static/img/favicon.png" rel="icon" type="image/png"/>
<link href="/static/theme.css-v-1.3.0r5.css" rel="stylesheet"/>
<script src="/static/theme_min.js">
</script>
</meta>
</head>
<body>
<div id="navbar">
<a href="/">
<img id="navbar-logo" src="/static/img/logo_navbar.png"/>
</a>
<div id="navbar-buttons">
<a href="/home.html">
Home
</a>
<a class="active" href="/challenges.html">
Challenges
</a>
<a href="/scoreboard.html">
Scoreboard
</a>
<a href="/profile.html">
</a>
<form action="/api" method="post">
</form>
</div>
</div>
<div id="body-content">
<div class="pre-category-name">
Challenge category:
</div>
<div class="category-name typewriter">
Cryptography
</div>
<div style="display:flex; flex-wrap:wrap">
<div class="decorator-square-container" style="transform: rotate(270deg)">
<div class="decorator-square-component" style="background-color:#009927">
</div>
<div class="decorator-square-component title-decorator-gray">
</div>
<div class="decorator-square-component decorator-square-icon" style="background-image: url('/static/img/icons/arrow.png');background-size: 16px;filter:invert(1);">
</div>
</div>
<a class="btn-solid btn-solid-warning" href="challenges-category-Binary+Exploitation.html" style="margin:0px 8px 8px 0px">
Binary Exploitation
</a>
<a class="btn-solid btn-solid-warning active" href="challenges-category-Cryptography.html" style="margin:0px 8px 8px 0px">
Cryptography
</a>
<a class="btn-solid btn-solid-warning" href="challenges-category-Forensics.html" style="margin:0px 8px 8px 0px">
Forensics
</a>
<a class="btn-solid btn-solid-warning" href="challenges-category-Miscellaneous.html" style="margin:0px 8px 8px 0px">
Miscellaneous
</a>
<a class="btn-solid btn-solid-warning" href="challenges-category-Networks.html" style="margin:0px 8px 8px 0px">
Networks
</a>
<a class="btn-solid btn-solid-warning" href="challenges-category-Radio+Frequency.html" style="margin:0px 8px 8px 0px">
Radio Frequency
</a>
<a class="btn-solid btn-solid-warning" href="challenges-category-Reverse+Engineering.html" style="margin:0px 8px 8px 0px">
Reverse Engineering
</a>
<a class="btn-solid btn-solid-warning" href="challenges-category-Web+Exploitation.html" style="margin:0px 8px 8px 0px">
Web Exploitation
</a>
<a class="btn-solid btn-solid-warning" href="challenges-category-Welcome.html" style="margin:0px 8px 8px 0px">
Welcome
</a>
</div>
<div style="margin-bottom: 8px">
</div>
<div class="card">
<div class="card-header">
<div style="display:flex">
<a href="challenge-id-3.html">
babynotrsa
</a>
<div class="challenge-points">
<img src="/static/img/icons/flag.png"/>
50 Points
</div>
</div>
<small>
</small>
</div>
<div class="card-content">
<p>
Everyone knows
<a href="https://en.wikipedia.org/wiki/RSA_(cryptosystem)">
RSA
</a>
, but everyone also knows that RSA is slow. Why not just use a faster operation than exponentiation?
</p>
<div style="margin-top:8px; display:flex; flex-wrap: wrap">
<a href="https://cdn.discordapp.com/attachments/1056103369695047750/1060551406244855868/chal.py" style="text-decoration:none; margin-right:8px; margin-bottom:8px" target="_blank">
<div class="tag tag-inline btn-solid btn-solid-link" style="margin-bottom:0px">
<img src="/static/img/icons/package.png" style="width:20px; height:20px; margin-right:8px">
chal.py
</img>
</div>
</a>
<a href="https://cdn.discordapp.com/attachments/1056103369695047750/1060551406563631114/output.txt" style="text-decoration:none; margin-right:8px; margin-bottom:8px" target="_blank">
<div class="tag tag-inline btn-solid btn-solid-link" style="margin-bottom:0px">
<img src="/static/img/icons/package.png" style="width:20px; height:20px; margin-right:8px">
output.txt
</img>
</div>
</a>
</div>
<div>
</div>
<div class="tag tag-inline" style="margin-bottom:0px">
<img src="/static/img/icons/user.png" style="width:20px; height:20px; margin-right:8px"/>
<b style="margin-right:8px">
By:
</b>
sera
</div>
</div>
</div>
<div class="card">
<div class="card-header">
<div style="display:flex">
<a href="challenge-id-13.html">
babymixup
</a>
<div class="challenge-points">
<img src="/static/img/icons/flag.png"/>
68 Points
</div>
</div>
<small>
</small>
</div>
<div class="card-content">
<p>
I encrypted a public string and the flag with AES. There's no known key recovery attacks against AES, so you can't decrypt the flag.
</p>
<div style="margin-top:8px; display:flex; flex-wrap: wrap">
<a href="https://cdn.discordapp.com/attachments/1056103369695047750/1056703912649949244/chal.py" style="text-decoration:none; margin-right:8px; margin-bottom:8px" target="_blank">
<div class="tag tag-inline btn-solid btn-solid-link" style="margin-bottom:0px">
<img src="/static/img/icons/package.png" style="width:20px; height:20px; margin-right:8px">
chal.py
</img>
</div>
</a>
<a href="https://cdn.discordapp.com/attachments/1056103369695047750/1056703912977125477/output.txt" style="text-decoration:none; margin-right:8px; margin-bottom:8px" target="_blank">
<div class="tag tag-inline btn-solid btn-solid-link" style="margin-bottom:0px">
<img src="/static/img/icons/package.png" style="width:20px; height:20px; margin-right:8px"/>
output.txt
</div>
</a>
</div>
<div>
</div>
<div class="tag tag-inline" style="margin-bottom:0px">
<img src="/static/img/icons/user.png" style="width:20px; height:20px; margin-right:8px"/>
<b style="margin-right:8px">
By:
</b>
sera
</div>
</div>
</div>
<div class="card">
<div class="card-header">
<div style="display:flex">
<a href="challenge-id-42.html">
Nonces and Keys
</a>
<div class="challenge-points">
<img src="/static/img/icons/flag.png"/>
374 Points
</div>
</div>
<small>
</small>
</div>
<div class="card-content">
<p>
Because of our revolutionary AES-128-OFB technology we have encrypted your user data so securely that even with the key (k=0x13371337133713371337133713371337) evil hackers can't read out the passwords!!!
</p>
<div style="margin-top:8px; display:flex; flex-wrap: wrap">
<a href="https://cdn.discordapp.com/attachments/1004152966510563448/1055599731277037638/challenge_enc.sqlite3" style="text-decoration:none; margin-right:8px; margin-bottom:8px" target="_blank">
<div class="tag tag-inline btn-solid btn-solid-link" style="margin-bottom:0px">
<img src="/static/img/icons/package.png" style="width:20px; height:20px; margin-right:8px">
challenge_enc.sqlite3
</img>
</div>
</a>
</div>
<div>
</div>
<div class="tag tag-inline" style="margin-bottom:0px">
<img src="/static/img/icons/user.png" style="width:20px; height:20px; margin-right:8px"/>
<b style="margin-right:8px">
By:
</b>
lambda
</div>
</div>
</div>
<div class="card">
<div class="card-header">
<div style="display:flex">
<a href="challenge-id-43.html">
SMarT 1
</a>
<div class="challenge-points">
<img src="/static/img/icons/flag.png"/>
442 Points
</div>
</div>
<small>
</small>
</div>
<div class="card-content">
<p>
I made a small, efficient block cipher. It's small because I can fit it on the page and it's efficient because it only uses the minimal amount of rounds. I didn't even try it but I'm sure it works. Here's some output with the key. Can you get the flag back out?
</p>
<div style="margin-top:8px; display:flex; flex-wrap: wrap">
<a href="https://cdn.discordapp.com/attachments/1056103369695047750/1060953189366628402/output1.txt" style="text-decoration:none; margin-right:8px; margin-bottom:8px" target="_blank">
<div class="tag tag-inline btn-solid btn-solid-link" style="margin-bottom:0px">
<img src="/static/img/icons/package.png" style="width:20px; height:20px; margin-right:8px">
output1.txt
</img>
</div>
</a>
<a href="https://cdn.discordapp.com/attachments/1056103369695047750/1060953188821385418/chal.py" style="text-decoration:none; margin-right:8px; margin-bottom:8px" target="_blank">
<div class="tag tag-inline btn-solid btn-solid-link" style="margin-bottom:0px">
<img src="/static/img/icons/package.png" style="width:20px; height:20px; margin-right:8px"/>
chal.py
</div>
</a>
</div>
<div>
</div>
<div class="tag tag-inline" style="margin-bottom:0px">
<img src="/static/img/icons/user.png" style="width:20px; height:20px; margin-right:8px"/>
<b style="margin-right:8px">
By:
</b>
sera
</div>
</div>
</div>
<div class="card">
<div class="card-header">
<div style="display:flex">
<a href="challenge-id-35.html">
AES-BAD-256
</a>
<div class="challenge-points">
<img src="/static/img/icons/flag.png"/>
485 Points
</div>
</div>
<small>
</small>
</div>
<div class="card-content">
<p>
I heard that some common block cipher modes have lots of footguns - using none (ECB) results in the legendary
<a href="https://words.filippo.io/the-ecb-penguin/">
ECB Penguin
</a>
, while others are vulnerable to
<a href="https://en.wikipedia.org/wiki/Bit-flipping_attack">
bit flipping
</a>
and
<a href="https://en.wikipedia.org/wiki/Padding_oracle_attack">
padding
</a>
attacks, so I made my own that would never fall to such a technique.
</p>
<div style="margin-top:8px; display:flex; flex-wrap: wrap">
<div href="nc aes.chal.irisc.tf 10100" style="text-decoration:none; margin-right:8px; margin-bottom:8px" target="_blank">
<div class="tag tag-inline btn-solid btn-solid-danger btn-solid-link btn-solid-link-unclickable" style="margin-bottom:0px">
<img src="/static/img/icons/target.png" style="width:20px; height:20px; margin-right:8px">
nc aes.chal.irisc.tf 10100
</img>
</div>
</div>
<a href="https://cdn.discordapp.com/attachments/1056103369695047750/1056104546314756106/chal.py" style="text-decoration:none; margin-right:8px; margin-bottom:8px" target="_blank">
<div class="tag tag-inline btn-solid btn-solid-link" style="margin-bottom:0px">
<img src="/static/img/icons/package.png" style="width:20px; height:20px; margin-right:8px"/>
chal.py
</div>
</a>
</div>
<div>
</div>
<div class="tag tag-inline" style="margin-bottom:0px">
<img src="/static/img/icons/user.png" style="width:20px; height:20px; margin-right:8px"/>
<b style="margin-right:8px">
By:
</b>
sera
</div>
</div>
</div>
<div class="card">
<div class="card-header">
<div style="display:flex">
<a href="challenge-id-45.html">
SMarT 2
</a>
<div class="challenge-points">
<img src="/static/img/icons/flag.png"/>
487 Points
</div>
</div>
<small>
</small>
</div>
<div class="card-content">
<p>
I'm sure you'll never guess what comes next: Now do it without the key!
</p>
<div style="margin-top:8px; display:flex; flex-wrap: wrap">
<a href="https://cdn.discordapp.com/attachments/1056103369695047750/1060953189098197052/output2.txt" style="text-decoration:none; margin-right:8px; margin-bottom:8px" target="_blank">
<div class="tag tag-inline btn-solid btn-solid-link" style="margin-bottom:0px">
<img src="/static/img/icons/package.png" style="width:20px; height:20px; margin-right:8px">
output2.txt
</img>
</div>
</a>
</div>
<div>
</div>
<div class="tag tag-inline" style="margin-bottom:0px">
<img src="/static/img/icons/user.png" style="width:20px; height:20px; margin-right:8px"/>
<b style="margin-right:8px">
By:
</b>
sera
</div>
</div>
</div>
</div>
<div id="footer">
<b>
<a href="https://github.com/Milkdrop/CTFx">
CTFx
</a>
</b>
v1.3.0r5
<br/>
Made with 🧡 by
<a href="https://gitlab.com/Milkdrop">
Milkdrop
</a>
, Based on
<a href="https://github.com/Nakiami/mellivora">
mellivora
</a>
</div>
<audio id="audio-typewriter" src="/static/audio/typewriter.mp3">
</audio>
<audio id="audio-nav-mouseover" src="/static/audio/nav_mouseover.mp3">
</audio>
<audio id="audio-nav-click" src="/static/audio/nav_click.mp3">
</audio>
<audio id="audio-btn-dynamic-mouseover" src="/static/audio/btn_dynamic_mouseover.mp3">
</audio>
<audio id="audio-btn-dynamic-click" src="/static/audio/btn_dynamic_click.mp3">
</audio>
<audio id="audio-btn-solid-mouseover" src="/static/audio/btn_solid_mouseover.mp3">
</audio>
<audio id="audio-btn-solid-click" src="/static/audio/btn_solid_click.mp3">
</audio>
<audio id="audio-checkbox-click" src="/static/audio/checkbox_click.mp3">
</audio>
<script src="/static/ctfx.js-v-1.3.0r5.js" type="text/javascript">
</script>
</body>
</html>