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<!DOCTYPE html>
<html lang="en" itemscope itemtype="https://schema.org/WebPage">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
<title>OffCrypt: Secure Message Encryption for Android</title>
<meta name="description"
content="Best secure messaging app without internet - OffCrypt offers military grade encryption for Android with offline file encryption, self-destructing messages, RSA 4096.">
<meta name="author" content="OffCrypt">
<meta name="last-modified" content="2025-11-06">
<meta name="robots" content="index, follow">
<link rel="canonical" href="https://www.dev-offcode.com/">
<link rel="alternate" hreflang="en" href="https://www.dev-offcode.com/">
<link rel="alternate" hreflang="x-default" href="https://www.dev-offcode.com/">
<link rel="icon" type="image/x-icon" href="/favicon.ico">
<link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png">
<link rel="icon" type="image/png" sizes="32x32" href="/favicon-32x32.png">
<link rel="icon" type="image/png" sizes="16x16" href="/favicon-16x16.png">
<link rel="manifest" href="/manifest.json">
<!-- Preload critical resources -->
<link rel="preload" href="styles-automation.css?v=3.0.5" as="style">
<link rel="preload" href="gallery-simple.css?v=3.0.2" as="style">
<link rel="preload" href="OffCrypt-Android.jpg" as="image">
<!-- Core Web Vitals optimization -->
<meta name="theme-color" content="#c45c26">
<meta name="msapplication-TileColor" content="#c45c26">
<meta name="msapplication-config" content="/browserconfig.xml">
<meta property="og:type" content="website">
<meta property="og:locale" content="en_US">
<meta property="og:url" content="https://www.dev-offcode.com/">
<meta property="og:title" content="OffCrypt: Secure Message Encryption for Android">
<meta property="og:description" content="A fully offline Android application for private and secure communication.">
<meta property="og:image" content="https://www.dev-offcode.com/OffCrypt-Android.jpg">
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:site" content="@OffCryptAndroid">
<meta name="twitter:creator" content="@OffCryptAndroid">
<meta name="twitter:url" content="https://www.dev-offcode.com/">
<meta name="twitter:title" content="OffCrypt: Secure Message Encryption for Android">
<meta name="twitter:description"
content="A fully offline Android application for private and secure communication.">
<meta name="twitter:image" content="https://www.dev-offcode.com/OffCrypt-Android.jpg">
<!-- Social Media Links -->
<meta property="og:see_also" content="https://www.instagram.com/off.crypt86/">
<meta property="og:see_also" content="https://www.youtube.com/@OffCrypt">
<meta name="instagram:site" content="@off.crypt86">
<meta name="youtube:channel" content="@OffCrypt">
<!-- Structured Data Schema -->
<script type="application/ld+json">
{
"@context": "https://schema.org",
"@type": "MobileApplication",
"name": "OffCrypt",
"applicationCategory": "SecurityApplication",
"operatingSystem": "Android",
"description": "Secure offline encryption app for Android with PGP-style messaging and RSA-4096 encryption",
"url": "https://www.dev-offcode.com/",
"image": "https://www.dev-offcode.com/OffCrypt-Android.jpg",
"offers": {
"@type": "Offer",
"price": "0",
"priceCurrency": "EUR",
"availability": "https://schema.org/InStock"
},
"downloadUrl": "https://www.dev-offcode.com/",
"inLanguage": ["en"],
"author": {
"@type": "Person",
"@id": "https://www.dev-offcode.com/#author",
"name": "EmptyCode0x86",
"url": "https://www.dev-offcode.com",
"sameAs": [
"https://twitter.com/OffCryptAndroid",
"https://www.instagram.com/off.crypt86/",
"https://www.youtube.com/@OffCrypt",
"https://github.com/emptycode0x86",
"https://bsky.app/profile/off-crypt86.bsky.social",
"https://www.linkedin.com/in/off-crypt-b94175382/"
]
},
"publisher": {
"@type": "Organization",
"@id": "https://www.dev-offcode.com/#organization",
"name": "OffCrypt",
"url": "https://www.dev-offcode.com",
"logo": {
"@type": "ImageObject",
"url": "https://www.dev-offcode.com/OffCrypt-Android.jpg"
},
"sameAs": [
"https://twitter.com/OffCryptAndroid",
"https://www.instagram.com/off.crypt86/",
"https://www.youtube.com/@OffCrypt",
"https://bsky.app/profile/off-crypt86.bsky.social",
"https://www.linkedin.com/in/off-crypt-b94175382/"
]
},
"softwareVersion": "2.0",
"datePublished": "2024-01-01",
"dateModified": "2025-11-06",
"featureList": [
"AES-256 encryption",
"RSA-4096 security",
"Offline messaging",
"Self-destructing messages",
"File encryption",
"PGP-style messaging"
],
"screenshot": [
"https://www.dev-offcode.com/OffCrypt-Android.jpg"
],
"softwareHelp": {
"@type": "CreativeWork",
"name": "OffCrypt Documentation",
"url": "https://www.dev-offcode.com/changelog.html"
}
}
</script>
<!-- FAQ Schema -->
<script type="application/ld+json">
{
"@context": "https://schema.org",
"@type": "FAQPage",
"mainEntity": [
{
"@type": "Question",
"name": "Does OffCrypt work without internet connection?",
"acceptedAnswer": {
"@type": "Answer",
"text": "Yes! OffCrypt is a fully offline Android application. All encryption and decryption happens locally on your device, ensuring your messages never leave your phone or touch any servers."
}
},
{
"@type": "Question",
"name": "What encryption algorithms does OffCrypt use?",
"acceptedAnswer": {
"@type": "Answer",
"text": "OffCrypt uses RSA-4096 for key exchange, AES-256 for message encryption, and supports PGP-style cryptography. These are standard, widely reviewed algorithms."
}
},
{
"@type": "Question",
"name": "How do self-destructing messages work?",
"acceptedAnswer": {
"@type": "Answer",
"text": "Self-destructing messages automatically delete themselves after being read or after a specified time period. Once deleted, the encrypted data is securely wiped from your device and cannot be recovered."
}
},
{
"@type": "Question",
"name": "Can I encrypt files with OffCrypt?",
"acceptedAnswer": {
"@type": "Answer",
"text": "Yes! OffCrypt supports file encryption for any file type. You can encrypt documents, photos, videos, and other files using the same strong encryption as messages."
}
},
{
"@type": "Question",
"name": "Is OffCrypt free to use?",
"acceptedAnswer": {
"@type": "Answer",
"text": "Yes, OffCrypt is completely free and open source. There are no hidden costs, subscriptions, or premium features. All encryption features are available to everyone."
}
},
{
"@type": "Question",
"name": "What Android versions are supported?",
"acceptedAnswer": {
"@type": "Answer",
"text": "OffCrypt supports Android 5.0 (Lollipop) and newer versions. The app is optimized for modern Android devices while maintaining compatibility with older phones."
}
}
]
}
</script>
<link rel="stylesheet" href="styles-automation.css?v=3.0.5">
<link rel="stylesheet" href="styles-at-extras.css?v=3.0.1">
<link rel="stylesheet" href="gallery-simple.css?v=3.0.2">
<!-- Tracking scripts loaded via cookie-consent.js after user consent -->
</head>
<body class="at-page">
<button class="mobile-menu-toggle" aria-label="Toggle Menu">
<span class="hamburger"></span>
</button>
<header class="at-nav">
<div class="at-nav__inner">
<aside class="sidebar">
<div class="sidebar-header">
<div class="sidebar-title">OffCode</div>
</div>
<nav class="sidebar-nav">
<ul class="sidebar-menu">
<li class="menu-item active">
<a href="index.html" class="menu-link">
<span class="menu-icon">📱</span>
<span class="menu-text">Android App</span>
</a>
</li>
<li class="menu-item">
<a href="OffCryptDesktop.html" class="menu-link">
<span class="menu-icon">💻</span>
<span class="menu-text">Desktop App</span>
</a>
</li>
<li class="menu-item">
<a href="ScreenLockBuilder.html" class="menu-link">
<span class="menu-icon">🔒</span>
<span class="menu-text">Screen Lock Builder</span>
</a>
</li>
<li class="menu-item">
<a href="ScreenLockBuilderPremium.html" class="menu-link">
<span class="menu-icon">⭐</span>
<span class="menu-text">Premium Builder</span>
</a>
</li>
<li class="menu-item">
<a href="AutomationTool.html" class="menu-link">
<span class="menu-icon">🤖</span>
<span class="menu-text">Automation Tool</span>
</a>
</li>
<li class="menu-item">
<a href="RemoteControl.html" class="menu-link">
<span class="menu-icon">🌐</span>
<span class="menu-text">Web Remote Control</span>
</a>
</li>
<li class="menu-item">
<a href="TorChatPage.html" class="menu-link">
<span class="menu-icon">🧅</span>
<span class="menu-text">Tor Chat</span>
</a>
</li>
<li class="menu-item">
<a href="https://ko-fi.com/emptyc0de" class="menu-link" target="_blank" rel="noopener noreferrer">
<span class="menu-icon">💝</span>
<span class="menu-text">Donate</span>
</a>
</li>
<li class="menu-item">
<a href="PrivacyPolicy.html" class="menu-link">
<span class="menu-icon">🔐</span>
<span class="menu-text">Privacy Policy</span>
</a>
</li>
</ul>
</nav>
<div class="sidebar-footer">
<p class="footer-text">Social media</p>
<div class="sidebar-social-divider"></div>
<div class="sidebar-social">
<a href="https://x.com/OffCryptAndroid" target="_blank" rel="noopener noreferrer"
aria-label="Follow OffCrypt on X">
<span class="sidebar-social-icon">🐦</span>
<span class="sidebar-social-label">X</span>
</a>
<a href="https://www.instagram.com/off.crypt86/" target="_blank" rel="noopener noreferrer"
aria-label="Follow OffCrypt on Instagram">
<span class="sidebar-social-icon">📸</span>
<span class="sidebar-social-label">Instagram</span>
</a>
<a href="https://www.tiktok.com/@offcrypt0" target="_blank" rel="noopener noreferrer"
aria-label="Follow OffCrypt on TikTok">
<span class="sidebar-social-icon">🎵</span>
<span class="sidebar-social-label">TikTok</span>
</a>
<a href="https://www.youtube.com/@OffCrypt" target="_blank" rel="noopener noreferrer"
aria-label="Follow OffCrypt on YouTube">
<span class="sidebar-social-icon">▶️</span>
<span class="sidebar-social-label">YouTube</span>
</a>
<a href="https://bsky.app/profile/off-crypt86.bsky.social" target="_blank" rel="noopener noreferrer"
aria-label="Follow OffCrypt on Bluesky">
<span class="sidebar-social-icon">🦋</span>
<span class="sidebar-social-label">Bluesky</span>
</a>
<a href="https://www.linkedin.com/in/off-crypt-b94175382/" target="_blank" rel="noopener noreferrer"
aria-label="Follow OffCrypt on LinkedIn">
<span class="sidebar-social-icon">💼</span>
<span class="sidebar-social-label">LinkedIn</span>
</a>
</div>
</div>
</aside>
</div>
</header>
<div class="main-wrapper">
<main class="at-main">
<section class="at-hero">
<span class="at-hero__eyebrow">Secure Android Encryption</span>
<h1 class="at-hero__title">OffCrypt - Android</h1>
<p class="at-hero__subtitle">Open-source</p>
<div class="at-hero__rule" aria-hidden="true"></div>
<p class="at-hero__lead">
OffCrypt is an offline encryption app for secure text and file
encryption using well-known cryptographic algorithms. A secure messaging app
that works without an internet connection, with both password-based and RSA public-key encryption
(AES-256 and RSA-4096) for Android.
</p>
<p class="at-hero__body">
This is a fully offline file encryption app - it does not connect to the internet or collect
any user data. All encryption and decryption happens locally on your device. Perfect for
journalists, business professionals, and privacy-conscious users who need secure document
sharing on Android without cloud dependencies.
</p>
<p class="at-hero__body">
Key features include self-destructing messages for Android, secure file deletion, how to
encrypt files on Android offline capabilities, and instant RSA 4096 encryption mobile app
functionality without account registration. Built for Android in Kotlin with zero data
collection policy for private messaging.
</p>
<p class="at-hero__body">
Need a <a href="ScreenLockBuilder.html">Windows screen lock</a>? Build a portable screen
locker for Windows with a custom message and password.
</p>
<div class="at-hero__cta-row">
<a href="#download" class="at-btn at-btn--primary">Download OffCrypt</a>
<a href="#pictures" class="at-btn at-btn--ghost">View Screenshots</a>
</div>
<div class="at-hero__chips">
<span class="at-chip"><span>🔑</span> PGP-Style Public Key Cryptography</span>
<span class="at-chip"><span>💻</span> Open-source</span>
<span class="at-chip"><span>🔒</span> Fully Offline application</span>
<span class="at-chip"><span>📄</span> File Encryption</span>
</div>
</section>
<!-- Modern Horizontal Scrolling Gallery -->
<section id="pictures" class="image-gallery-container">
<div class="gallery-header">
<h2 class="gallery-title">Screenshots</h2>
<p class="gallery-subtitle">Explore the app interface • <span class="scroll-hint">👈 Scroll
horizontally</span></p>
</div>
<div class="image-gallery">
<div class="image-card featured" data-image="OffCrypt-Android.jpg" data-title="" data-desc="">
<img src="OffCrypt-Android.jpg" alt="OffCrypt Android app main interface">
<div class="image-overlay">
<div class="zoom-icon">🔍</div>
</div>
</div>
<div class="image-card" data-image="OffCryptDecryption.jpg" data-title="" data-desc="">
<img src="OffCryptDecryption.jpg" alt="OffCrypt decryption interface with RSA 4096 encryption">
<div class="image-overlay">
<div class="zoom-icon">🔍</div>
</div>
</div>
<div class="image-card" data-image="FileSettings.jpg" data-title="" data-desc="">
<img src="FileSettings.jpg" alt="OffCrypt security settings with AES-256 encryption">
<div class="image-overlay">
<div class="zoom-icon">🔍</div>
</div>
</div>
<div class="image-card" data-image="FileEncryption.jpg" data-title="" data-desc="">
<img src="FileEncryption.jpg" alt="OffCrypt file encryption interface">
<div class="image-overlay">
<div class="zoom-icon">🔍</div>
</div>
</div>
<div class="image-card" data-image="FileDecryption.jpg" data-title="" data-desc="">
<img src="FileDecryption.jpg" alt="OffCrypt file decryption settings panel">
<div class="image-overlay">
<div class="zoom-icon">🔍</div>
</div>
</div>
</div>
</section>
<!-- Custom Image Modal -->
<div id="imageModal" class="image-modal">
<div class="modal-backdrop"></div>
<div class="modal-content">
<button class="modal-close" aria-label="Close">×</button>
<div class="modal-nav">
<button class="modal-prev" aria-label="Previous">‹</button>
<button class="modal-next" aria-label="Next">›</button>
</div>
<img id="modalImage" src="" alt="">
<div class="modal-info">
<h3 id="modalTitle"></h3>
<p id="modalDesc"></p>
</div>
<div class="modal-counter">
<span id="modalCounter">1 / 4</span>
</div>
</div>
</div>
<!-- Features Section -->
<section id="features" class="at-section">
<div class="at-section__header">
<h2 class="at-section__title">Features</h2>
<p class="at-section__subtitle">Explore all 36+ security features</p>
</div>
<div class="at-feature-grid">
<!-- Cryptography Feature -->
<div class="at-feature-card">
<div class="feature-icon">🔐</div>
<h3>Modern Cryptography</h3>
<p>Encryption algorithms</p>
<ul class="at-feature-list">
<li>🔑 RSA-2048 & RSA-4096</li>
<li>🛡️ AES-256-GCM encryption</li>
<li>🔐 PBKDF2 key derivation</li>
<li>🏷️ HmacSHA256 integrity</li>
<li>⚡ SHA-256 hash functions</li>
<li>🎲 SecureRandom generation</li>
</ul>
</div>
<!-- Advanced Security Feature -->
<div class="at-feature-card">
<div class="feature-icon">✨</div>
<h3>Advanced Security</h3>
<p>Protection features</p>
<ul class="at-feature-list">
<li>✍️ Digital signatures</li>
<li>🔄 Perfect Forward Secrecy</li>
<li>⏰ Expiring messages</li>
<li>🔥 Burn After Reading</li>
<li>🔒 Version detection</li>
</ul>
</div>
<!-- Attack Protection Feature -->
<div class="at-feature-card">
<div class="feature-icon">🛡️</div>
<h3>Attack Protection</h3>
<p>Defense against sophisticated threats</p>
<ul class="at-feature-list">
<li>⚖️ Constant-time operations</li>
<li>🔍 Data validation</li>
<li>❌ Replay attack prevention</li>
<li>🔐 Side-channel protection</li>
<li>🛡️ MITM protection</li>
</ul>
</div>
<!-- Memory Safety Feature -->
<div class="at-feature-card">
<div class="feature-icon">🧹</div>
<h3>Memory Safety</h3>
<p>Complete sensitive data protection</p>
<ul class="at-feature-list">
<li>🧹 Data scrubbing (3x overwrite)</li>
<li>💾 Char/ByteArray wiping</li>
<li>♻️ Aggressive Garbage Collection</li>
<li>📋 Log buffer clearing</li>
<li>🔄 String pool cleanup</li>
</ul>
</div>
<!-- UI Security Feature -->
<div class="at-feature-card">
<div class="feature-icon">📱</div>
<h3>UI Security</h3>
<p>Advanced interface protection</p>
<ul class="at-feature-list">
<li>📋 Secure Clipboard</li>
<li>🔒 Lifecycle cleanup</li>
<li>⏸️ Background cleanup</li>
<li>🚨 Burn dialog warnings</li>
<li>👁️ Screenshot protection</li>
</ul>
</div>
<!-- Professional Features -->
<div class="at-feature-card">
<div class="feature-icon">⚙️</div>
<h3>Features</h3>
<p>Advanced cryptographic capabilities</p>
<ul class="at-feature-list">
<li>🧠 RSA OAEP + SHA-256</li>
<li>📜 RSA signature with SHA-512</li>
<li>📦 Version Byte detection</li>
<li>🔁 Metadata fallback</li>
<li>📤 Encrypted file export</li>
<li>🔒 Encrypted RSA keystore</li>
</ul>
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<span class="at-chip-badge">🛡️ AES-256-GCM</span>
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<span class="at-chip-badge">⚡ Perfect Forward Secrecy</span>
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<h3>🔒 Complete Your Privacy Protection</h3>
<p>You've secured your messages with OffCrypt - now protect your internet connection too</p>
<p class="at-highlight"><strong>Multi-hop:</strong> Channel traffic through additional servers
for extra encryption layers</p>
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Windows-side tools on this site.</p>
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<h3>💻 OffCrypt Desktop for Windows</h3>
<p>Continue the same offline encryption mindset on Windows with local messaging, secure file
handling, and modern cryptography.</p>
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<h3>🔒 Windows Screen Lock Builder</h3>
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addition to encrypted communication.</p>
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<h3>📝 Track Android updates</h3>
<p>Review the latest OffCrypt release notes to see new encryption, file protection, and
messaging improvements.</p>
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