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challenges-category-Cryptography.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8"/>
<title>
Challenges : IrisCTF 2025 - 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." 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"/>
<!-- CSS -->
<link href="/static/ctfx.css-v-1.3.0.css" rel="stylesheet"/>
</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>
<a href="/news.html">
<div id="news-bar">
News (click for archive)
</div>
</a>
<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-Open-Source+Intelligence.html" style="margin:0px 8px 8px 0px">
Open-Source Intelligence
</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-11.html">
KittyCrypt
</a>
<div class="challenge-points">
<img src="/static/img/icons/flag.png"/>
50 Points
</div>
</div>
<small>
</small>
</div>
<div class="card-content">
<div style="margin-top: -4px; display:flex; flex-wrap: wrap">
<span class="btn-solid btn-solid-warning" style="margin:0px 8px 8px 0px; background-color: #3333bb;">
<img src="/static/img/icons/tag.png" style="width: 16px; padding-right: 4px;"/>
easy
</span>
<span class="btn-solid btn-solid-warning" style="margin:0px 8px 8px 0px; background-color: #3333bb;">
<img src="/static/img/icons/tag.png" style="width: 16px; padding-right: 4px;"/>
🐈
</span>
</div>
<p>
You managed to get access to the KittyCorp encryption system code! But it seems like it requires some sort of keycode in order to decode the catnip storage password.
</p>
<p>
<br/>
</p>
<p>
Thankfully, you managed to find a test file with both an input and an output! How handy! Maybe you can use this to find the key?
</p>
<div style="margin-top:8px; display:flex; flex-wrap: wrap">
<a href="https://cdn.2025.irisc.tf/kittycrypt.tar.gz" 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">
kittycrypt.tar.gz
</img>
</div>
</a>
</div>
<div>
<div class="tag tag-inline">
<img src="/static/img/icons/info.png" style="width:20px; height:20px; margin-right:8px">
<b style="margin-right:8px">
Hint!
</b>
<p>
example_output and flag_output use the same keys!
</p>
</img>
</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>
User
</div>
</div>
</div>
<div class="card">
<div class="card-header">
<div style="display:flex">
<a href="challenge-id-18.html">
knutsacque
</a>
<div class="challenge-points">
<img src="/static/img/icons/flag.png"/>
316 Points
</div>
</div>
<small>
</small>
</div>
<div class="card-content">
<div style="margin-top: -4px; display:flex; flex-wrap: wrap">
<span class="btn-solid btn-solid-warning" style="margin:0px 8px 8px 0px; background-color: #3333bb;">
<img src="/static/img/icons/tag.png" style="width: 16px; padding-right: 4px;"/>
medium
</span>
</div>
<p>
Behold my original knut sacque scheme in 4D
</p>
<div style="margin-top:8px; display:flex; flex-wrap: wrap">
<a href="https://cdn.2025.irisc.tf/knutsacque.tar.gz" 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">
knutsacque.tar.gz
</img>
</div>
</a>
</div>
<div>
<div class="tag tag-inline">
<img src="/static/img/icons/info.png" style="width:20px; height:20px; margin-right:8px"/>
<b style="margin-right:8px">
Hint!
</b>
<p>
Flag format is not required for intended solution; but it matches
<code>
irisctf{[a-z_-!]+}
</code>
</p>
</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-17.html">
AYES
</a>
<div class="challenge-points">
<img src="/static/img/icons/flag.png"/>
448 Points
</div>
</div>
<small>
</small>
</div>
<div class="card-content">
<div style="margin-top: -4px; display:flex; flex-wrap: wrap">
<span class="btn-solid btn-solid-warning" style="margin:0px 8px 8px 0px; background-color: #3333bb;">
<img src="/static/img/icons/tag.png" style="width: 16px; padding-right: 4px;"/>
easy
</span>
<span class="btn-solid btn-solid-warning" style="margin:0px 8px 8px 0px; background-color: #3333bb;">
<img src="/static/img/icons/tag.png" style="width: 16px; padding-right: 4px;"/>
or not?
</span>
</div>
<p>
Something is a bit off with my AES implementation. Get it?
</p>
<p>
<br/>
</p>
<p>
AES implementation is directly from
<a href="https://github.com/boppreh/aes">
here
</a>
.
</p>
<div style="margin-top:8px; display:flex; flex-wrap: wrap">
<div href="nc ayes.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 ayes.chal.irisc.tf 10100
</img>
</div>
</div>
<a href="https://cdn.2025.irisc.tf/ayes.tar.gz" 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"/>
ayes.tar.gz
</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-19.html">
SPHINCS5
</a>
<div class="challenge-points">
<img src="/static/img/icons/flag.png"/>
500 Points
</div>
</div>
<small>
</small>
</div>
<div class="card-content">
<div style="margin-top: -4px; display:flex; flex-wrap: wrap">
<span class="btn-solid btn-solid-warning" style="margin:0px 8px 8px 0px; background-color: #3333bb;">
<img src="/static/img/icons/tag.png" style="width: 16px; padding-right: 4px;"/>
hard
</span>
</div>
<p>
My Super Stable SPHINCS+ Signature Service is Now Available!
</p>
<div style="margin-top:8px; display:flex; flex-wrap: wrap">
<div href="nc sphincs5.chal.irisc.tf 10103" 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 sphincs5.chal.irisc.tf 10103
</img>
</div>
</div>
<a href="https://cdn.2025.irisc.tf/sphincs5.tar.gz" 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"/>
sphincs5.tar.gz
</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>
Forked from
<a href="https://github.com/Milkdrop/CTFx">
CTFx
</a>
</b>
v1.3.0, developed by
<a href="https://irissec.xyz/">
IrisSec
</a>
.
<br/>
CTFx by
<a href="https://gitlab.com/Milkdrop">
Milkdrop
</a>
, based on
<a href="https://github.com/Nakiami/mellivora">
Mellivora
</a>
.
<br/>
WebGL version developed by
<a href="https://github.com/nesrak1">
nope
</a>
.
<a href="/redir-choice-wgl.html">
Go to WebGL version
</a>
</div>
<!-- JS -->
<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-1.3.0.js" type="text/javascript">
</script>
</body>
</html>