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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Instruo CTF Challenge 2025 - Writeups & Solutions</title>
<meta name="description" content="Comprehensive writeups and solutions for Instruo CTF 2025 challenges from IIEST. Learn steganography, reverse engineering, cryptography, and web security.">
<script src="https://cdn.tailwindcss.com"></script>
<style>
@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@300;400;500;600;700&display=swap');
* {
font-family: 'IBM Plex Mono', monospace;
}
body {
background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
min-height: 100vh;
}
.glass {
background: rgba(255, 255, 255, 0.1);
backdrop-filter: blur(10px);
-webkit-backdrop-filter: blur(10px);
border: 1px solid rgba(255, 255, 255, 0.2);
box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
}
.glass-card {
background: rgba(255, 255, 255, 0.15);
backdrop-filter: blur(12px);
-webkit-backdrop-filter: blur(12px);
border: 1px solid rgba(255, 255, 255, 0.25);
box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
transition: all 0.3s ease;
}
.glass-card:hover {
transform: translateY(-5px);
background: rgba(255, 255, 255, 0.2);
box-shadow: 0 12px 40px 0 rgba(0, 0, 0, 0.4);
}
.badge {
background: rgba(255, 255, 255, 0.2);
backdrop-filter: blur(8px);
-webkit-backdrop-filter: blur(8px);
border: 1px solid rgba(255, 255, 255, 0.3);
}
.nav-link {
position: relative;
transition: all 0.3s ease;
}
.nav-link::after {
content: '';
position: absolute;
bottom: -2px;
left: 0;
width: 0;
height: 2px;
background: white;
transition: width 0.3s ease;
}
.nav-link:hover::after {
width: 100%;
}
.category-badge-steg {
background: linear-gradient(135deg, #4a5568 0%, #2d3748 100%);
}
.category-badge-rev {
background: linear-gradient(135deg, #5a67d8 0%, #434190 100%);
}
.category-badge-web {
background: linear-gradient(135deg, #2c5282 0%, #2a4365 100%);
}
.category-badge-crypto {
background: linear-gradient(135deg, #276749 0%, #22543d 100%);
}
.category-badge-misc {
background: linear-gradient(135deg, #975a16 0%, #744210 100%);
}
.difficulty-easy {
color: #10b981;
}
.difficulty-medium {
color: #f59e0b;
}
.difficulty-hard {
color: #ef4444;
}
.difficulty-expert {
color: #8b5cf6;
}
.pulse-animation {
animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}
@keyframes pulse {
0%, 100% {
opacity: 1;
}
50% {
opacity: .7;
}
}
.fade-in {
animation: fadeIn 0.6s ease-in;
}
@keyframes fadeIn {
from {
opacity: 0;
transform: translateY(20px);
}
to {
opacity: 1;
transform: translateY(0);
}
}
</style>
</head>
<body class="antialiased">
<!-- Navigation -->
<nav class="glass fixed w-full z-50 top-0">
<div class="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
<div class="flex items-center justify-between h-16">
<div class="flex items-center">
<div class="flex-shrink-0">
<h1 class="text-white text-2xl font-bold flex items-center">
<svg class="w-6 h-6 mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M3 21v-4m0 0V5a2 2 0 012-2h6.5l1 1H21l-3 6 3 6h-8.5l-1-1H5a2 2 0 00-2 2zm9-13.5V9"></path>
</svg>
Instruo CTF
</h1>
</div>
</div>
<div class="hidden md:block">
<div class="ml-10 flex items-baseline space-x-4">
<a href="#home" class="nav-link text-white hover:text-gray-200 px-3 py-2 text-sm font-medium">Home</a>
<a href="#challenges" class="nav-link text-white hover:text-gray-200 px-3 py-2 text-sm font-medium">Challenges</a>
<a href="#tools" class="nav-link text-white hover:text-gray-200 px-3 py-2 text-sm font-medium">Tools</a>
<a href="https://github.com/gradientgeeks/instruo-ctf" target="_blank" class="nav-link text-white hover:text-gray-200 px-3 py-2 text-sm font-medium">GitHub</a>
</div>
</div>
</div>
</div>
</nav>
<!-- Hero Section -->
<section id="home" class="pt-32 pb-20 px-4 sm:px-6 lg:px-8">
<div class="max-w-7xl mx-auto">
<div class="glass rounded-3xl p-12 text-center fade-in">
<div class="inline-block badge rounded-full px-4 py-2 mb-6">
<span class="text-white text-sm font-semibold">IIEST • Instruo 2025</span>
</div>
<h1 class="text-5xl md:text-7xl font-extrabold text-white mb-6">
CTF Challenge Writeups
</h1>
<p class="text-xl md:text-2xl text-white text-opacity-90 mb-8 max-w-3xl mx-auto">
Comprehensive solutions and methodologies for steganography, reverse engineering, cryptography, and web security challenges
</p>
<div class="flex flex-col sm:flex-row gap-4 justify-center">
<a href="#challenges" class="glass-card px-8 py-4 rounded-xl text-white font-semibold text-lg hover:scale-105 transform transition">
Explore Challenges →
</a>
<a href="https://github.com/gradientgeeks/instruo-ctf" target="_blank" class="glass-card px-8 py-4 rounded-xl text-white font-semibold text-lg hover:scale-105 transform transition">
<svg class="w-5 h-5 inline mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M11.049 2.927c.3-.921 1.603-.921 1.902 0l1.519 4.674a1 1 0 00.95.69h4.915c.969 0 1.371 1.24.588 1.81l-3.976 2.888a1 1 0 00-.363 1.118l1.518 4.674c.3.922-.755 1.688-1.538 1.118l-3.976-2.888a1 1 0 00-1.176 0l-3.976 2.888c-.783.57-1.838-.197-1.538-1.118l1.518-4.674a1 1 0 00-.363-1.118l-3.976-2.888c-.784-.57-.38-1.81.588-1.81h4.914a1 1 0 00.951-.69l1.519-4.674z"></path>
</svg>
Star on GitHub
</a>
</div>
</div>
</div>
</section>
<!-- Stats Section -->
<section class="pb-20 px-4 sm:px-6 lg:px-8">
<div class="max-w-7xl mx-auto">
<div class="grid grid-cols-1 md:grid-cols-4 gap-6">
<div class="glass-card rounded-2xl p-6 text-center fade-in">
<div class="text-4xl font-bold text-white mb-2">14</div>
<div class="text-white text-opacity-80">Challenges Solved</div>
</div>
<div class="glass-card rounded-2xl p-6 text-center fade-in">
<div class="text-4xl font-bold text-white mb-2">7</div>
<div class="text-white text-opacity-80">Categories Covered</div>
</div>
<div class="glass-card rounded-2xl p-6 text-center fade-in">
<div class="text-4xl font-bold text-white mb-2">25+</div>
<div class="text-white text-opacity-80">Tools Used</div>
</div>
<div class="glass-card rounded-2xl p-6 text-center fade-in">
<div class="text-4xl font-bold text-white mb-2">100%</div>
<div class="text-white text-opacity-80">Educational Value</div>
</div>
</div>
</div>
</section>
<!-- Challenges Section -->
<section id="challenges" class="pb-20 px-4 sm:px-6 lg:px-8">
<div class="max-w-7xl mx-auto">
<div class="text-center mb-12">
<h2 class="text-4xl md:text-5xl font-bold text-white mb-4">Challenge Writeups</h2>
<p class="text-xl text-white text-opacity-80">Click on any challenge to view the complete solution</p>
</div>
<div class="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6">
<!-- Challenge Card 1: Welcome Everyone -->
<a href="src/welcome-everyone.html" class="glass-card rounded-2xl p-6 hover:cursor-pointer fade-in">
<div class="flex items-start justify-between mb-4">
<div class="badge category-badge-web rounded-full px-3 py-1 text-xs text-white font-semibold">
Web
</div>
<svg class="w-8 h-8 text-white" fill="none" stroke="currentColor" viewBox="0 0 24 24">
<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M21 12a9 9 0 01-9 9m9-9a9 9 0 00-9-9m9 9H3m9 9a9 9 0 01-9-9m9 9c1.657 0 3-4.03 3-9s-1.343-9-3-9m0 18c-1.657 0-3-4.03-3-9s1.343-9 3-9m-9 9a9 9 0 019-9"></path>
</svg>
</div>
<h3 class="text-2xl font-bold text-white mb-2">Welcome Everyone</h3>
<p class="text-white text-opacity-80 mb-4 text-sm">Your first challenge! Find the flag in JavaScript bundle</p>
<div class="flex items-center justify-between">
<span class="badge rounded-lg px-3 py-1 text-xs text-white">150 pts</span>
<span class="text-green-400 font-semibold">Easy</span>
</div>
<div class="mt-4 pt-4 border-t border-white border-opacity-20">
<code class="text-xs text-white text-opacity-70 break-all">EOF{f0und_m3_f!nally}</code>
</div>
</a>
<!-- Challenge Card 2: Sanity Check -->
<a href="src/sanity-check.html" class="glass-card rounded-2xl p-6 hover:cursor-pointer fade-in">
<div class="flex items-start justify-between mb-4">
<div class="badge rounded-full px-3 py-1 text-xs text-white font-semibold" style="background: linear-gradient(135deg, #6b7280 0%, #4b5563 100%);">
General
</div>
<svg class="w-8 h-8 text-white" fill="none" stroke="currentColor" viewBox="0 0 24 24">
<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 12h6m-6 4h6m2 5H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z"></path>
</svg>
</div>
<h3 class="text-2xl font-bold text-white mb-2">Sanity Check ⚠️</h3>
<p class="text-white text-opacity-80 mb-4 text-sm">Mandatory! Find flag in rulebook PDF (disqualification if not solved)</p>
<div class="flex items-center justify-between">
<span class="badge rounded-lg px-3 py-1 text-xs text-white bg-red-700">MANDATORY</span>
<span class="text-green-400 font-semibold">Easy</span>
</div>
<div class="mt-4 pt-4 border-t border-white border-opacity-20">
<code class="text-xs text-white text-opacity-70 break-all">EOF{h3r3_w3_90_4941n}</code>
</div>
</a>
<!-- Challenge Card 3: Nothing Hidden Inside -->
<a href="src/nothing-hidden-inside.html" class="glass-card rounded-2xl p-6 hover:cursor-pointer fade-in">
<div class="flex items-start justify-between mb-4">
<div class="badge category-badge-steg rounded-full px-3 py-1 text-xs text-white font-semibold">
Steganography
</div>
<svg class="w-8 h-8 text-white" fill="none" stroke="currentColor" viewBox="0 0 24 24">
<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15 12a3 3 0 11-6 0 3 3 0 016 0z"></path>
<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M2.458 12C3.732 7.943 7.523 5 12 5c4.478 0 8.268 2.943 9.542 7-1.274 4.057-5.064 7-9.542 7-4.477 0-8.268-2.943-9.542-7z"></path>
</svg>
</div>
<h3 class="text-2xl font-bold text-white mb-2">Hiding in Plain Sight</h3>
<p class="text-white text-opacity-80 mb-4 text-sm">PDF with hidden text after EOF marker</p>
<div class="flex items-center justify-between">
<span class="badge rounded-lg px-3 py-1 text-xs text-white">150 pts</span>
<span class="text-green-400 font-semibold">Easy</span>
</div>
<div class="mt-4 pt-4 border-t border-white border-opacity-20">
<code class="text-xs text-white text-opacity-70 break-all">EOF{u_r_@_ch!ck3n}</code>
</div>
</a>
<!-- Challenge Card 4: Wrong Number -->
<a href="src/wrong-number.html" class="glass-card rounded-2xl p-6 hover:cursor-pointer fade-in">
<div class="flex items-start justify-between mb-4">
<div class="badge category-badge-crypto rounded-full px-3 py-1 text-xs text-white font-semibold">
Crypto
</div>
<svg class="w-8 h-8 text-white" fill="none" stroke="currentColor" viewBox="0 0 24 24">
<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 15v2m-6 4h12a2 2 0 002-2v-6a2 2 0 00-2-2H6a2 2 0 00-2 2v6a2 2 0 002 2zm10-10V7a4 4 0 00-8 0v4h8z"></path>
</svg>
</div>
<h3 class="text-2xl font-bold text-white mb-2">Wrong Number</h3>
<p class="text-white text-opacity-80 mb-4 text-sm">Audio password, AES-encrypted ZIP, and ROT-20 cipher</p>
<div class="flex items-center justify-between">
<span class="badge rounded-lg px-3 py-1 text-xs text-white">150 pts</span>
<span class="text-green-400 font-semibold">Easy</span>
</div>
<div class="mt-4 pt-4 border-t border-white border-opacity-20">
<code class="text-xs text-white text-opacity-70 break-all">EOF{4nd4n_w4_d1nw4v4w}</code>
</div>
</a>
<!-- Challenge Card 5: GitLab Repo -->
<a href="src/gitlab-repo.html" class="glass-card rounded-2xl p-6 hover:cursor-pointer fade-in">
<div class="flex items-start justify-between mb-4">
<div class="badge rounded-full px-3 py-1 text-xs text-white font-semibold" style="background: linear-gradient(135deg, #7c3aed 0%, #5b21b6 100%);">
OSINT
</div>
<svg class="w-8 h-8 text-white" fill="none" stroke="currentColor" viewBox="0 0 24 24">
<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z"></path>
</svg>
</div>
<h3 class="text-2xl font-bold text-white mb-2">A Noob's First Milestone</h3>
<p class="text-white text-opacity-80 mb-4 text-sm">GitLab profile search and source code analysis</p>
<div class="flex items-center justify-between">
<span class="badge rounded-lg px-3 py-1 text-xs text-white">150 pts</span>
<span class="text-green-400 font-semibold">Easy</span>
</div>
<div class="mt-4 pt-4 border-t border-white border-opacity-20">
<code class="text-xs text-white text-opacity-70 break-all">EOF{script_kiddie@eofool.com}</code>
</div>
</a>
<!-- Challenge Card 6: Timeless Melodies -->
<a href="src/timeless-melodies.html" class="glass-card rounded-2xl p-6 hover:cursor-pointer fade-in">
<div class="flex items-start justify-between mb-4">
<div class="badge category-badge-crypto rounded-full px-3 py-1 text-xs text-white font-semibold">
Cryptography
</div>
<svg class="w-8 h-8 text-white" fill="none" stroke="currentColor" viewBox="0 0 24 24">
<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 19V6l12-3v13M9 19c0 1.105-1.343 2-3 2s-3-.895-3-2 1.343-2 3-2 3 .895 3 2zm12-3c0 1.105-1.343 2-3 2s-3-.895-3-2 1.343-2 3-2 3 .895 3 2zM9 10l12-3"></path>
</svg>
</div>
<h3 class="text-2xl font-bold text-white mb-2">Timeless Melodies</h3>
<p class="text-white text-opacity-80 mb-4 text-sm">Morse code in audio + Vigenère cipher with "Für Elise" key</p>
<div class="flex items-center justify-between">
<span class="badge rounded-lg px-3 py-1 text-xs text-white">150 pts</span>
<span class="text-green-400 font-semibold">Easy</span>
</div>
<div class="mt-4 pt-4 border-t border-white border-opacity-20">
<code class="text-xs text-white text-opacity-70 break-all">EOF{decrypted_text}</code>
</div>
</a>
<!-- Challenge Card 1: Like Finding a Needle in the Hay Stack -->
<a href="src/absolutely-normal.html" class="glass-card rounded-2xl p-6 hover:cursor-pointer fade-in">
<div class="flex items-start justify-between mb-4">
<div class="badge category-badge-steg rounded-full px-3 py-1 text-xs text-white font-semibold">
Steganography
</div>
<svg class="w-8 h-8 text-white" fill="none" stroke="currentColor" viewBox="0 0 24 24">
<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z"></path>
</svg>
</div>
<h3 class="text-2xl font-bold text-white mb-2">Like Finding a Needle in the Hay Stack</h3>
<p class="text-white text-opacity-80 mb-4 text-sm">Multi-layered steganography with PNG, MP3 extraction, and Caesar cipher</p>
<div class="flex items-center justify-between">
<span class="badge rounded-lg px-3 py-1 text-xs text-white">500 pts</span>
<span class="difficulty-hard font-semibold">Hard</span>
</div>
<div class="mt-4 pt-4 border-t border-white border-opacity-20">
<code class="text-xs text-white text-opacity-70 break-all">EOF{b3war3_!t$_c0m!ng_f0r_u}</code>
</div>
</a>
<!-- Challenge Card 2: Fooled -->
<a href="src/fooled.html" class="glass-card rounded-2xl p-6 hover:cursor-pointer fade-in">
<div class="flex items-start justify-between mb-4">
<div class="badge category-badge-rev rounded-full px-3 py-1 text-xs text-white font-semibold">
Reverse Engineering
</div>
<svg class="w-8 h-8 text-white" fill="none" stroke="currentColor" viewBox="0 0 24 24">
<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M10.325 4.317c.426-1.756 2.924-1.756 3.35 0a1.724 1.724 0 002.573 1.066c1.543-.94 3.31.826 2.37 2.37a1.724 1.724 0 001.065 2.572c1.756.426 1.756 2.924 0 3.35a1.724 1.724 0 00-1.066 2.573c.94 1.543-.826 3.31-2.37 2.37a1.724 1.724 0 00-2.572 1.065c-.426 1.756-2.924 1.756-3.35 0a1.724 1.724 0 00-2.573-1.066c-1.543.94-3.31-.826-2.37-2.37a1.724 1.724 0 00-1.065-2.572c-1.756-.426-1.756-2.924 0-3.35a1.724 1.724 0 001.066-2.573c-.94-1.543.826-3.31 2.37-2.37.996.608 2.296.07 2.572-1.065z"></path>
<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15 12a3 3 0 11-6 0 3 3 0 016 0z"></path>
</svg>
</div>
<h3 class="text-2xl font-bold text-white mb-2">Fooled</h3>
<p class="text-white text-opacity-80 mb-4 text-sm">ELF binary analysis, custom encryption, and base64 decoding</p>
<div class="flex items-center justify-between">
<span class="badge rounded-lg px-3 py-1 text-xs text-white">600 pts</span>
<span class="difficulty-hard font-semibold">Hard</span>
</div>
<div class="mt-4 pt-4 border-t border-white border-opacity-20">
<code class="text-xs text-white text-opacity-70 break-all">EOF{not_a_foolish_person_ig}</code>
</div>
</a>
<!-- Challenge Card 3: Random Gibberish -->
<a href="src/random-gibberish.html" class="glass-card rounded-2xl p-6 hover:cursor-pointer fade-in">
<div class="flex items-start justify-between mb-4">
<div class="badge category-badge-misc rounded-full px-3 py-1 text-xs text-white font-semibold">
Misc
</div>
<svg class="w-8 h-8 text-white" fill="none" stroke="currentColor" viewBox="0 0 24 24">
<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M7 21a4 4 0 01-4-4V5a2 2 0 012-2h4a2 2 0 012 2v12a4 4 0 01-4 4zm0 0h12a2 2 0 002-2v-4a2 2 0 00-2-2h-2.343M11 7.343l1.657-1.657a2 2 0 012.828 0l2.829 2.829a2 2 0 010 2.828l-8.486 8.485M7 17h.01"></path>
</svg>
</div>
<h3 class="text-2xl font-bold text-white mb-2">Random Gibberish</h3>
<p class="text-white text-opacity-80 mb-4 text-sm">Esoteric NGFYU language, base64 URLs, and brightness/contrast steganography</p>
<div class="flex items-center justify-between">
<span class="badge rounded-lg px-3 py-1 text-xs text-white">200 pts</span>
<span class="difficulty-medium font-semibold">Medium</span>
</div>
<div class="mt-4 pt-4 border-t border-white border-opacity-20">
<code class="text-xs text-white text-opacity-70 break-all">EOF{@stley}</code>
</div>
</a>
<!-- Challenge Card 4: Recursive Hell -->
<a href="src/recursive_hell.html" class="glass-card rounded-2xl p-6 hover:cursor-pointer fade-in">
<div class="flex items-start justify-between mb-4">
<div class="badge category-badge-steg rounded-full px-3 py-1 text-xs text-white font-semibold">
Steganography
</div>
<svg class="w-8 h-8 text-white" fill="none" stroke="currentColor" viewBox="0 0 24 24">
<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 4v5h.582m15.356 2A8.001 8.001 0 004.582 9m0 0H9m11 11v-5h-.581m0 0a8.003 8.003 0 01-15.357-2m15.357 2H15"></path>
</svg>
</div>
<h3 class="text-2xl font-bold text-white mb-2">Recursive Hell</h3>
<p class="text-white text-opacity-80 mb-4 text-sm">68 nested ZIPs and 48 base64 layers - 116 total iterations!</p>
<div class="flex items-center justify-between">
<span class="badge rounded-lg px-3 py-1 text-xs text-white">Expert</span>
<span class="difficulty-expert font-semibold">Expert</span>
</div>
<div class="mt-4 pt-4 border-t border-white border-opacity-20">
<code class="text-xs text-white text-opacity-70 break-all">EOF{its_a_damn_loop}</code>
</div>
</a>
<!-- Challenge Card 5: Amen -->
<a href="src/amen.html" class="glass-card rounded-2xl p-6 hover:cursor-pointer fade-in">
<div class="flex items-start justify-between mb-4">
<div class="badge category-badge-rev rounded-full px-3 py-1 text-xs text-white font-semibold">
Reverse Engineering
</div>
<svg class="w-8 h-8 text-white" fill="none" stroke="currentColor" viewBox="0 0 24 24">
<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M10.325 4.317c.426-1.756 2.924-1.756 3.35 0a1.724 1.724 0 002.573 1.066c1.543-.94 3.31.826 2.37 2.37a1.724 1.724 0 001.065 2.572c1.756.426 1.756 2.924 0 3.35a1.724 1.724 0 00-1.066 2.573c.94 1.543-.826 3.31-2.37 2.37a1.724 1.724 0 00-2.572 1.065c-.426 1.756-2.924 1.756-3.35 0a1.724 1.724 0 00-2.573-1.066c-1.543.94-3.31-.826-2.37-2.37a1.724 1.724 0 00-1.065-2.572c-1.756-.426-1.756-2.924 0-3.35a1.724 1.724 0 001.066-2.573c-.94-1.543.826-3.31 2.37-2.37.996.608 2.296.07 2.572-1.065z"></path>
<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15 12a3 3 0 11-6 0 3 3 0 016 0z"></path>
</svg>
</div>
<h3 class="text-2xl font-bold text-white mb-2">Amen</h3>
<p class="text-white text-opacity-80 mb-4 text-sm">32-bit binary, PRNG-based encryption, and data array extraction</p>
<div class="flex items-center justify-between">
<span class="badge rounded-lg px-3 py-1 text-xs text-white">Medium</span>
<span class="difficulty-medium font-semibold">Medium</span>
</div>
<div class="mt-4 pt-4 border-t border-white border-opacity-20">
<code class="text-xs text-white text-opacity-70 break-all">EOF{wh3r3_ar3_my_po1n+5}</code>
</div>
</a>
<!-- Challenge Card 8: Banananana -->
<a href="src/banananana.html" class="glass-card rounded-2xl p-6 hover:cursor-pointer fade-in">
<div class="flex items-start justify-between mb-4">
<div class="badge category-badge-steg rounded-full px-3 py-1 text-xs text-white font-semibold">
Steganography
</div>
<svg class="w-8 h-8 text-white" fill="none" stroke="currentColor" viewBox="0 0 24 24">
<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 19V6l12-3v13M9 19c0 1.105-1.343 2-3 2s-3-.895-3-2 1.343-2 3-2 3 .895 3 2zm12-3c0 1.105-1.343 2-3 2s-3-.895-3-2 1.343-2 3-2 3 .895 3 2zM9 10l12-3"></path>
</svg>
</div>
<h3 class="text-2xl font-bold text-white mb-2">Banananana 🍌</h3>
<p class="text-white text-opacity-80 mb-4 text-sm">Simple string extraction from WAV file</p>
<div class="flex items-center justify-between">
<span class="badge rounded-lg px-3 py-1 text-xs text-white">200 pts</span>
<span class="difficulty-medium font-semibold">Medium</span>
</div>
<div class="mt-4 pt-4 border-t border-white border-opacity-20">
<code class="text-xs text-white text-opacity-70 break-all">EOF{hidden_among_bananananananana}</code>
</div>
</a>
<!-- Challenge Card 10: Apples -->
<a href="src/apples.html" class="glass-card rounded-2xl p-6 hover:cursor-pointer fade-in">
<div class="flex items-start justify-between mb-4">
<div class="badge rounded-full px-3 py-1 text-xs text-white font-semibold" style="background: linear-gradient(135deg, #7c3aed 0%, #5b21b6 100%);">
OSINT
</div>
<svg class="w-8 h-8 text-white" fill="none" stroke="currentColor" viewBox="0 0 24 24">
<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z"></path>
</svg>
</div>
<h3 class="text-2xl font-bold text-white mb-2">Apples 🍎</h3>
<p class="text-white text-opacity-80 mb-4 text-sm">Death Note themed: YouTube → Caesar cipher → Google Drive → strings</p>
<div class="flex items-center justify-between">
<span class="badge rounded-lg px-3 py-1 text-xs text-white">300 pts</span>
<span class="difficulty-hard font-semibold">Hard</span>
</div>
<div class="mt-4 pt-4 border-t border-white border-opacity-20">
<code class="text-xs text-white text-opacity-70 break-all">EOF{apples_apples_everywhere_raaaah}</code>
</div>
</a>
<!-- Challenge Card 11: Cannon Ball -->
<a href="src/cannon-ball.html" class="glass-card rounded-2xl p-6 hover:cursor-pointer fade-in">
<div class="flex items-start justify-between mb-4">
<div class="badge category-badge-web rounded-full px-3 py-1 text-xs text-white font-semibold">
Web
</div>
<svg class="w-8 h-8 text-white" fill="none" stroke="currentColor" viewBox="0 0 24 24">
<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M21 12a9 9 0 01-9 9m9-9a9 9 0 00-9-9m9 9H3m9 9a9 9 0 01-9-9m9 9c1.657 0 3-4.03 3-9s-1.343-9-3-9m0 18c-1.657 0-3-4.03-3-9s1.343-9 3-9m-9 9a9 9 0 019-9"></path>
</svg>
</div>
<h3 class="text-2xl font-bold text-white mb-2">Cannon Ball</h3>
<p class="text-white text-opacity-80 mb-4 text-sm">Web recon, hidden resources, base64 URIs, and LSB steganography</p>
<div class="flex items-center justify-between">
<span class="badge rounded-lg px-3 py-1 text-xs text-white">Medium</span>
<span class="difficulty-medium font-semibold">Medium</span>
</div>
<div class="mt-4 pt-4 border-t border-white border-opacity-20">
<code class="text-xs text-white text-opacity-70 break-all">EOF{F0und_!t}</code>
</div>
</a>
</div>
</div>
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<h2 class="text-4xl font-bold text-white mb-8 text-center">Essential CTF Tools</h2>
<div class="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6 mb-8">
<div class="badge rounded-xl p-4">
<h3 class="text-lg font-semibold text-white mb-2 flex items-center">
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<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z"></path>
</svg>
Steganography
</h3>
<p class="text-sm text-white text-opacity-80">binwalk, exiftool, zsteg, steghide, strings</p>
</div>
<div class="badge rounded-xl p-4">
<h3 class="text-lg font-semibold text-white mb-2 flex items-center">
<svg class="w-5 h-5 mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M10.325 4.317c.426-1.756 2.924-1.756 3.35 0a1.724 1.724 0 002.573 1.066c1.543-.94 3.31.826 2.37 2.37a1.724 1.724 0 001.065 2.572c1.756.426 1.756 2.924 0 3.35a1.724 1.724 0 00-1.066 2.573c.94 1.543-.826 3.31-2.37 2.37a1.724 1.724 0 00-2.572 1.065c-.426 1.756-2.924 1.756-3.35 0a1.724 1.724 0 00-2.573-1.066c-1.543.94-3.31-.826-2.37-2.37a1.724 1.724 0 00-1.065-2.572c-1.756-.426-1.756-2.924 0-3.35a1.724 1.724 0 001.066-2.573c-.94-1.543.826-3.31 2.37-2.37.996.608 2.296.07 2.572-1.065z"></path>
<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15 12a3 3 0 11-6 0 3 3 0 016 0z"></path>
</svg>
Reverse Engineering
</h3>
<p class="text-sm text-white text-opacity-80">Ghidra, IDA Pro, GDB, objdump, radare2</p>
</div>
<div class="badge rounded-xl p-4">
<h3 class="text-lg font-semibold text-white mb-2 flex items-center">
<svg class="w-5 h-5 mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M21 12a9 9 0 01-9 9m9-9a9 9 0 00-9-9m9 9H3m9 9a9 9 0 01-9-9m9 9c1.657 0 3-4.03 3-9s-1.343-9-3-9m0 18c-1.657 0-3-4.03-3-9s1.343-9 3-9m-9 9a9 9 0 019-9"></path>
</svg>
Web Security
</h3>
<p class="text-sm text-white text-opacity-80">curl, Burp Suite, wget, DevTools</p>
</div>
<div class="badge rounded-xl p-4">
<h3 class="text-lg font-semibold text-white mb-2 flex items-center">
<svg class="w-5 h-5 mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 15v2m-6 4h12a2 2 0 002-2v-6a2 2 0 00-2-2H6a2 2 0 00-2 2v6a2 2 0 002 2zm10-10V7a4 4 0 00-8 0v4h8z"></path>
</svg>
Cryptography
</h3>
<p class="text-sm text-white text-opacity-80">CyberChef, hashcat, john, openssl</p>
</div>
<div class="badge rounded-xl p-4">
<h3 class="text-lg font-semibold text-white mb-2 flex items-center">
<svg class="w-5 h-5 mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M10 20l4-16m4 4l4 4-4 4M6 16l-4-4 4-4"></path>
</svg>
Scripting
</h3>
<p class="text-sm text-white text-opacity-80">Python, Bash, Ruby, Node.js</p>
</div>
<div class="badge rounded-xl p-4">
<h3 class="text-lg font-semibold text-white mb-2 flex items-center">
<svg class="w-5 h-5 mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 6V4m0 2a2 2 0 100 4m0-4a2 2 0 110 4m-6 8a2 2 0 100-4m0 4a2 2 0 110-4m0 4v2m0-6V4m6 6v10m6-2a2 2 0 100-4m0 4a2 2 0 110-4m0 4v2m0-6V4"></path>
</svg>
Utilities
</h3>
<p class="text-sm text-white text-opacity-80">file, hexdump, xxd, dd, base64</p>
</div>
</div>
<div class="text-center">
<a href="https://github.com/gradientgeeks/instruo-ctf#-tools--prerequisites" target="_blank" class="inline-block badge rounded-xl px-6 py-3 text-white font-semibold hover:scale-105 transform transition">
View Complete Tool List →
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