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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 Desktop – Windows PC Encryption Suite</title>
<meta name="description"
content="OffCrypt Desktop — PC encryption for Windows 10 and 11. NIST 2024 compliant ECDH+HKDF+AES-GCM and X25519 cryptography. Disappearing messages, identity management, secure file operations.">
<meta name="author" content="OffCrypt">
<meta name="last-modified" content="2026-07-19">
<meta name="robots" content="index, follow">
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<link rel="preload" href="OffCrypt-Windows.jpg" as="image">
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<meta property="og:title" content="OffCrypt Desktop – Windows PC Encryption Suite">
<meta property="og:description" content="PC encryption for Windows 10 and 11 — fully offline app for private and secure communication.">
<meta property="og:image" content="https://www.dev-offcode.com/OffCrypt-Windows.jpg">
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:site" content="@OffCryptAndroid">
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<meta name="twitter:title" content="OffCrypt Desktop – Windows PC Encryption Suite">
<meta name="twitter:description"
content="PC encryption for Windows 10 and 11 — fully offline app for private and secure communication.">
<meta name="twitter:image" content="https://www.dev-offcode.com/OffCrypt-Windows.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">
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{
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"mainEntity": [
{
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"name": "What is ECDH+HKDF+AES-GCM encryption?",
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"@type": "Answer",
"text": "ECDH (Elliptic Curve Diffie-Hellman) generates shared secrets, HKDF (HMAC-based Key Derivation Function) derives encryption keys, and AES-GCM provides authenticated encryption. This combination follows NIST 2024 guidance for modern authenticated encryption."
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},
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"name": "Can I use OffCrypt Desktop for file encryption?",
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"name": "What Windows versions are supported?",
"acceptedAnswer": {
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</head>
<body>
<!-- Sidebar Navigation -->
<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">
<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 active">
<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">
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<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>
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<span class="menu-icon">💝</span>
<span class="menu-text">Donate</span>
</a>
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</a>
</li>
</ul>
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<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>
<!-- Mobile Menu Toggle -->
<button class="mobile-menu-toggle" aria-label="Toggle Menu">
<span class="hamburger"></span>
</button>
<!-- Main Content Wrapper -->
<div class="main-wrapper">
<main>
<!-- App Description Section -->
<section class="intro-section">
<div class="intro-container">
<div class="intro-content">
<!-- Hero Header -->
<h1 class="hero-title">💻 OffCrypt - Desktop</h1>
<p class="hero-subtitle">Open-source</p>
<div class="hero-glow-divider"></div>
<p class="intro-description lead-text">
OffCrypt Desktop is a Windows PC encryption application providing secure text and file encryption
using cutting-edge cryptographic algorithms. Encrypt files on your Windows PC with both password-based encryption
(ECDH+HKDF+AES-GCM) and X25519 public-key cryptography with NIST 2024 compliance for maximum
security. Works on Windows 10 and Windows 11.
</p>
<p class="intro-description">
This is a completely offline encryption application - no internet connection required or
used. All cryptographic operations happen locally on your Windows PC with zero data
collection. Perfect for professionals, journalists, and privacy-conscious users who need
secure communication without cloud dependencies.
</p>
<p class="intro-description">
Advanced features include disappearing messages with configurable expiration times,
PGP-style identity management with contact trust levels, multiple ECDH curve options, and
file encryption with .enc and .pgp format support. Built for Windows 10 and 11 with
careful memory handling and solid security defaults.
</p>
<p class="intro-description">
Looking for a <a href="ScreenLockBuilder.html">screen locker for Windows</a>? Create a
portable Windows screen lock with your own message.
</p>
<div class="intro-highlights">
<div class="highlight-item">
<span class="highlight-icon">🔑</span>
<span class="highlight-text">PGP-Style Public Key Cryptography</span>
</div>
<div class="highlight-item">
<span class="highlight-icon">💻</span>
<span class="highlight-text">Open-source</span>
</div>
<div class="highlight-item">
<span class="highlight-icon">🔒</span>
<span class="highlight-text">Fully Offline application</span>
</div>
<div class="highlight-item">
<span class="highlight-icon">📄</span>
<span class="highlight-text">File Encryption</span>
</div>
</div>
</div>
</div>
</section>
<!-- How to Use Section -->
<section id="how-to-use" class="how-to-use-section">
<div class="how-to-use-container">
<h2 class="how-to-use-title">🎯 How to Use</h2>
<p class="how-to-use-subtitle">Step-by-step guide to secure encryption</p>
<div class="usage-methods">
<!-- Password-Based Method -->
<div class="method-card">
<div class="method-header">
<div class="method-icon">🔐</div>
<h3>Password-Based Encryption</h3>
<p>Simple and secure password-protected messages</p>
</div>
<div class="method-steps">
<div class="step-item">
<div class="step-number">1</div>
<div class="step-text">
<h4>Set Master Password</h4>
<p>Enter a strong password (8+ characters) and click "Set Password". Stored
securely in memory.</p>
</div>
</div>
<div class="step-item">
<div class="step-number">2</div>
<div class="step-text">
<h4>Encrypt Message</h4>
<p>Type your message, configure disappearing options, then click "Encrypt" to
create secure text.</p>
</div>
</div>
<div class="step-item">
<div class="step-number">3</div>
<div class="step-text">
<h4>Share & Decrypt</h4>
<p>Message auto-copies to clipboard. Share via any channel. Recipients decrypt
with the same password.</p>
</div>
</div>
</div>
</div>
<!-- X25519 Public Key Method -->
<div class="method-card">
<div class="method-header">
<div class="method-icon">🔑</div>
<h3>X25519 Public Key</h3>
<p>PGP-style secure communication without servers</p>
</div>
<div class="method-steps">
<div class="step-item">
<div class="step-number">1</div>
<div class="step-text">
<h4>Generate Keys</h4>
<p>Click "Generate Keys" to create your X25519 key pair. Keys protected with
Windows DPAPI.</p>
</div>
</div>
<div class="step-item">
<div class="step-number">2</div>
<div class="step-text">
<h4>Share Public Key</h4>
<p>Copy and share your public key with anyone who wants to send you encrypted
messages.</p>
</div>
</div>
<div class="step-item">
<div class="step-number">3</div>
<div class="step-text">
<h4>Import & Communicate</h4>
<p>Import recipient's public key, then send secure messages only they can read.
</p>
</div>
</div>
</div>
</div>
<!-- Advanced Features Method -->
<div class="method-card">
<div class="method-header">
<div class="method-icon">⚙️</div>
<h3>Advanced Features</h3>
<p>Cryptographic toolkit</p>
</div>
<div class="advanced-features-grid">
<div class="feature-item">
<div class="feature-icon-small">⏰</div>
<h4>Disappearing Messages</h4>
<p>Set expiration times for sensitive messages</p>
</div>
<div class="feature-item">
<div class="feature-icon-small">👤</div>
<h4>Identity Management</h4>
<p>PGP-style identities with trust levels</p>
</div>
<div class="feature-item">
<div class="feature-icon-small">🔧</div>
<h4>ECDH Configuration</h4>
<p>Choose P-256, P-384, P-521 curves</p>
</div>
<div class="feature-item">
<div class="feature-icon-small">📁</div>
<h4>File Operations</h4>
<p>Create .enc and .pgp encrypted files</p>
</div>
</div>
</div>
</div>
</div>
</section>
<!-- PIA Horizontal Banner -->
<section class="pia-banner-section">
<div class="pia-banner-container">
<div class="pia-banner-content">
<h3>🌍 High-Speed VPN Servers in 91 Countries Worldwide</h3>
<p>Connect to any location globally for maximum privacy and unrestricted access</p>
<a href='https://www.privateinternetaccess.com/pages/buy-vpn/npw' class="pia-banner-btn"
title='Get Private Internet Access VPN'>
🚀 Get Global Access
</a>
</div>
<div class="pia-banner-logo">
<a href='https://www.privateinternetaccess.com/pages/buy-vpn/npw'
title='Private Internet Access VPN'>
<img alt='Private Internet Access - Global VPN Network' border='0' src='PIALogo.png'>
</a>
</div>
</div>
</section>
<!-- Modern Horizontal Scrolling Gallery -->
<section id="pictures" class="image-gallery-container">
<div class="gallery-header">
<h2 class="gallery-title" style="color: white;">💻 Screenshots</h2>
<p class="gallery-subtitle">Explore the desktop application • <span class="scroll-hint">👈 Scroll
horizontally</span></p>
</div>
<div class="image-gallery">
<div class="image-card featured" data-image="SettingsWindows.png" data-title="" data-desc="">
<img src="SettingsWindows.png" alt="OffCrypt Desktop main interface for Windows">
<div class="image-overlay">
<div class="zoom-icon">🔍</div>
</div>
</div>
<div class="image-card" data-image="PasswordModeWindows.png" data-title="" data-desc="">
<img src="PasswordModeWindows.png" alt="OffCrypt password mode with AES-256-GCM encryption">
<div class="image-overlay">
<div class="zoom-icon">🔍</div>
</div>
</div>
<div class="image-card" data-image="PublicKeyModeWindows.png" data-title="" data-desc="">
<img src="PublicKeyModeWindows.png"
alt="Share your public key with anyone who wants to send you encrypted messages">
<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>
<!-- Modern Divider -->
<div class="section-divider"></div>
<!-- Features Section -->
<section id="features" class="features-section">
<div class="features-container">
<h2 class="features-title">🔐 Desktop Features</h2>
<p class="features-subtitle">Encryption capabilities for Windows</p>
<div class="features-grid">
<!-- Cryptography Feature -->
<div class="feature-card">
<div class="feature-icon">🔐</div>
<h3>Modern Cryptography</h3>
<ul class="feature-list">
<li>🔄 ECDH + HKDF + AES-GCM</li>
<li>🔑 X25519 + AES-GCM</li>
<li>🛡️ AES-256-GCM encryption</li>
<li>🔐 HKDF key derivation</li>
<li>🏷️ ECDH P-256/P-384/P-521</li>
<li>⚡ Windows DPAPI protection</li>
</ul>
</div>
<!-- Public Key Feature -->
<div class="feature-card">
<div class="feature-icon">✨</div>
<h3>X25519 Public Key</h3>
<p>PGP-style secure communication</p>
<ul class="feature-list">
<li>🔑 X25519 Key Generation</li>
<li>👤 Identity Management</li>
<li>🤝 Contact Trust Levels</li>
<li>⚡ Perfect Forward Secrecy</li>
<li>🔐 Windows DPAPI Storage</li>
</ul>
</div>
<!-- Disappearing Messages Feature -->
<div class="feature-card">
<div class="feature-icon">⏰</div>
<h3>Disappearing Messages</h3>
<p>Time-limited secure communication</p>
<ul class="feature-list">
<li>⏰ Automatic Expiration</li>
<li>📅 Flexible Time Units</li>
<li>🔒 Cryptographic Timing</li>
<li>🔥 Permanent Destruction</li>
<li>🛡️ Forward Secrecy</li>
</ul>
</div>
<!-- Attack Protection Feature -->
<div class="feature-card">
<div class="feature-icon">🛡️</div>
<h3>Attack Protection</h3>
<p>Defense against sophisticated threats</p>
<ul class="feature-list">
<li>⚖️ Constant-time Operations</li>
<li>🔍 Input Validation</li>
<li>❌ Replay Attack Prevention</li>
<li>🔐 Memory Protection</li>
<li>🛡️ Version Detection</li>
</ul>
</div>
<!-- Memory Safety Feature -->
<div class="feature-card">
<div class="feature-icon">🧹</div>
<h3>Memory Safety</h3>
<p>Complete sensitive data protection</p>
<ul class="feature-list">
<li>🔒 Char[] Arrays</li>
<li>🧹 Automatic Memory Clearing</li>
<li>♻️ Forced Garbage Collection</li>
<li>📋 Clipboard Management</li>
<li>🗑️ Secure Disposal</li>
</ul>
</div>
<!-- File Operations Feature -->
<div class="feature-card">
<div class="feature-icon">📁</div>
<h3>File Operations</h3>
<p>Secure file handling and storage</p>
<ul class="feature-list">
<li>📄 .ENC Files</li>
<li>🔐 .PGP Files</li>
<li>📥 File Import</li>
<li>💾 Secure Storage</li>
<li>🗑️ Secure Deletion</li>
</ul>
</div>
</div>
</div>
</section>
<!-- Modern Section Divider -->
<div class="section-divider"></div>
<!-- Download Section -->
<section id="download" class="download-section">
<div class="download-container download-container-desktop">
<h2 class="download-title">🚀 Download</h2>
<div class="version-notice">
<p><strong>📢 Latest version: v1.0</strong></p>
</div>
<a href="https://github.com/EmptyCode0x86/OffCrypt-Desktop-v1.0/releases/download/OffCryptDesktop/OffCrypt.exe"
class="button primary-download" target="_blank" rel="noopener noreferrer"
aria-label="Download OffCrypt for Windows">
⬇️ Download OffCrypt for windows (.exe)
</a>
<p class="download-info">Free • No ads • Open source • GPL-3.0 License</p>
<p class="download-info">View on GitHub:</p>
<div style="display: flex; gap: 1rem; flex-wrap: wrap; justify-content: center;">
<a href="https://github.com/EmptyCode0x86/OffCrypt-Desktop-v1.0/"
class="button secondary-download" target="_blank" rel="noopener noreferrer"
aria-label="View OffCrypt on GitHub">
💻 View on GitHub
</a>
</div>
<div
style="display: flex; justify-content: center; align-items: center; gap: 20px; margin-top: 20px; flex-wrap: wrap;">
<a href="https://peerpush.net/p/offcrypt-desktop" target="_blank" rel="noopener noreferrer">
<img src="https://peerpush.net/p/offcrypt-desktop/badge.png" alt="OffCrypt Desktop badge"
style="height: 50px; width: auto;" />
</a>
<a href='https://www.saashub.com/offcrypt-desktop?utm_source=badge&utm_campaign=badge&utm_content=offcrypt-desktop&badge_variant=color&badge_kind=approved'
target='_blank' rel="noopener noreferrer">
<img src="https://cdn-b.saashub.com/img/badges/approved-color.png?v=1"
alt="OffCrypt Desktop badge" style="height: 50px; width: auto;" />
</a>
</div>
</div>
</section>
<section class="features-section">
<div class="features-container">
<h2 class="features-title">Build the full encryption stack</h2>
<p class="features-subtitle">Use the desktop suite as part of a broader privacy cluster across
Android and Windows protection tools.</p>
<div class="features-grid">
<div class="feature-card">
<div class="feature-icon">📱</div>
<h3>OffCrypt for Android</h3>
<p>Use the Android version when you need fully offline message encryption and secure file
protection on mobile devices.</p>
<a href="index.html" class="button secondary-download">See the Android app</a>
</div>
<div class="feature-card">
<div class="feature-icon">🔒</div>
<h3>Windows Screen Lock Builder</h3>
<p>Add workstation locking and local access protection alongside your Windows encryption
workflow.</p>
<a href="ScreenLockBuilder.html" class="button secondary-download">Compare with Screen Lock
Builder</a>
</div>
<div class="feature-card">
<div class="feature-icon">🔐</div>
<h3>Privacy and data handling</h3>
<p>Review how data, consent, and product-specific licensing information are handled across
the OffCode site.</p>
<a href="PrivacyPolicy.html" class="button secondary-download">Read the privacy policy</a>
</div>
</div>
</div>
</section>
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