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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>OffCode – Privacy-Focused Encryption, Security & Automation Software</title>
<meta name="description"
content="OffCode (dev-offcode.com): privacy-focused software by an independent Finnish developer: free open-source OffCrypt encryption for Android and Windows, Screen Lock Builder, AI Automation Tool, self-hosted Web Remote Control and Tor Chat.">
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<!-- [SUOSITUS] yhdistä nämä 4 CSS-tiedostoa buildissa yhdeksi minifioiduksi tiedostoksi -->
<link rel="stylesheet" href="styles-automation.css?v=3.1.1">
<link rel="stylesheet" href="boot-gate.css?v=1">
<link rel="stylesheet" href="boot-code.css?v=7">
<link rel="stylesheet" href="styles-at-extras.css?v=3.2.4">
<link rel="stylesheet" href="cookie-consent.css">
<link rel="stylesheet" href="index-sections.css?v=6">
</head>
<body class="at-page">
<button class="mobile-menu-toggle" type="button" aria-label="Open menu" aria-controls="site-nav" aria-expanded="false">
<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" id="site-nav" aria-label="Main">
<ul class="sidebar-menu">
<li class="menu-item active">
<a href="/" class="menu-link" aria-current="page">
<span class="menu-icon at-icon at-icon--home" aria-hidden="true"></span>
<span class="menu-text">Home</span>
</a>
</li>
<li class="menu-item">
<a href="OffCryptAndroid.html" class="menu-link">
<span class="menu-icon at-icon at-icon--phone" aria-hidden="true"></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 at-icon at-icon--monitor" aria-hidden="true"></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 at-icon at-icon--lock" aria-hidden="true"></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 at-icon at-icon--star" aria-hidden="true"></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 at-icon at-icon--cpu" aria-hidden="true"></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 at-icon at-icon--cast" aria-hidden="true"></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 at-icon at-icon--layers" aria-hidden="true"></span>
<span class="menu-text">Tor Chat</span>
</a>
</li>
<li class="menu-item">
<a href="Community.html" class="menu-link">
<span class="menu-icon at-icon at-icon--message" aria-hidden="true"></span>
<span class="menu-text">Community</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 at-icon at-icon--heart" aria-hidden="true"></span>
<span class="menu-text">Donate</span>
</a>
</li>
<li class="menu-item">
<a href="PrivacyPolicy.html" class="menu-link">
<span class="menu-icon at-icon at-icon--shield" aria-hidden="true"></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 at-icon at-icon--x" aria-hidden="true"></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 at-icon at-icon--camera" aria-hidden="true"></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 at-icon at-icon--music" aria-hidden="true"></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 at-icon at-icon--play" aria-hidden="true"></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 at-icon at-icon--butterfly" aria-hidden="true"></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 at-icon at-icon--briefcase" aria-hidden="true"></span>
<span class="sidebar-social-label">LinkedIn</span>
</a>
</div>
</div>
</aside>
</div>
</header>
<div class="main-wrapper">
<main class="at-main">
<!-- Hero -->
<section class="at-hero at-hero--gate">
<div class="at-gate boot-gate force-motion">
<div class="boot-code force-motion" aria-hidden="true">
<div class="boot-code__snip s1">
<span class="n58">fun encrypt(plain: ByteArray, key: SecretKey): ByteArray {</span>
<span class="n49"> val c = Cipher.getInstance("AES/GCM/NoPadding")</span>
<span class="n34"> c.init(Cipher.ENCRYPT_MODE, key)</span>
<span class="n15"> val iv = c.iv</span>
<span class="n30"> return iv + c.doFinal(plain)</span>
<span class="n1">}</span>
</div>
<div class="boot-code__snip s2">
<span class="n50">val spec = KeyGenParameterSpec.Builder("offcrypt",</span>
<span class="n34"> KeyProperties.PURPOSE_ENCRYPT or</span>
<span class="n32"> KeyProperties.PURPOSE_DECRYPT)</span>
<span class="n46"> .setBlockModes(KeyProperties.BLOCK_MODE_GCM)</span>
<span class="n26"> .setKeySize(256).build()</span>
<span class="n20">ks.generateKey(spec)</span>
</div>
<div class="boot-code__snip s3">
<span class="n39">fun sha256(msg: ByteArray): ByteArray {</span>
<span class="n45"> return MessageDigest.getInstance("SHA-256")</span>
<span class="n16"> .digest(msg)</span>
<span class="n1">}</span>
<span class="n24">val rnd = SecureRandom()</span>
<span class="n20">rnd.nextBytes(nonce)</span>
</div>
<div class="boot-code__snip s4">
<span class="n24">fun rsa4096(): KeyPair {</span>
<span class="n47"> val kpg = KeyPairGenerator.getInstance("RSA")</span>
<span class="n22"> kpg.initialize(4096)</span>
<span class="n30"> return kpg.generateKeyPair()</span>
<span class="n1">}</span>
<span class="n21">val pub = pair.public</span>
</div>
<div class="boot-code__snip s5">
<span class="n55">fun encryptGcm(keyHex: String, plain: String): String {</span>
<span class="n27"> val nonce = ByteArray(12)</span>
<span class="n33"> SecureRandom().nextBytes(nonce)</span>
<span class="n49"> val c = Cipher.getInstance("AES/GCM/NoPadding")</span>
<span class="n57"> c.init(ENCRYPT_MODE, key, GCMParameterSpec(128, nonce))</span>
<span class="n47"> return Base64.encode(nonce + c.doFinal(utf8))</span>
</div>
<div class="boot-code__snip s6">
<span class="n26">fun wipe(buf: ByteArray) {</span>
<span class="n31"> SecureRandom().nextBytes(buf)</span>
<span class="n13"> buf.fill(0)</span>
<span class="n1">}</span>
<span class="n32">keystore.deleteEntry("offcrypt")</span>
<span class="n22">Arrays.fill(secret, 0)</span>
</div>
<div class="boot-code__snip s7">
<span class="n60">fun decrypt(key: ByteArray, payload: ByteArray): ByteArray {</span>
<span class="n40"> val nonce = payload.copyOfRange(0, 12)</span>
<span class="n39"> val tag = payload.copyOfRange(12, 28)</span>
<span class="n48"> val ct = payload.copyOfRange(28, payload.size)</span>
<span class="n49"> val c = Cipher.getInstance("AES/GCM/NoPadding")</span>
<span class="n28"> return c.doFinal(ct + tag)</span>
</div>
<div class="boot-code__snip s8">
<span class="n54">c.init(Cipher.DECRYPT_MODE, SecretKeySpec(key, "AES"),</span>
<span class="n31"> GCMParameterSpec(128, nonce))</span>
<span class="n27">require(payload.size >= 28)</span>
<span class="n40">fun hexToBytes(hex: String): ByteArray {</span>
<span class="n27"> require(hex.length == 64)</span>
<span class="n38"> return String(plain, Charsets.UTF_8)</span>
</div>
</div>
<div class="gate-stage" aria-hidden="true">
<div class="gate-tilt">
<span class="gate-orbit gate-orbit--1"></span>
<span class="gate-orbit gate-orbit--2"></span>
<span class="gate-orbit gate-orbit--3"></span>
<span class="gate-orbit gate-orbit--4"></span>
<span class="gate-orbit gate-orbit--5"></span>
<div class="gate-onion">
<span class="gate-layer gate-layer--3"></span>
<span class="gate-layer gate-layer--2"></span>
<span class="gate-layer gate-layer--1"></span>
<span class="gate-core"></span>
<span class="gate-tie gate-tie--1"></span>
<span class="gate-tie gate-tie--2"></span>
<span class="gate-tie gate-tie--3"></span>
<span class="gate-tie gate-tie--4"></span>
<span class="gate-tie gate-tie--5"></span>
<span class="gate-spark gate-spark--1"></span>
<span class="gate-spark gate-spark--2"></span>
<span class="gate-spark gate-spark--3"></span>
<span class="gate-blip gate-blip--1" aria-hidden="true"></span>
<span class="gate-blip gate-blip--2" aria-hidden="true"></span>
<span class="gate-blip gate-blip--3" aria-hidden="true"></span>
<span class="gate-blip gate-blip--4" aria-hidden="true"></span>
<span class="gate-blip gate-blip--5" aria-hidden="true"></span>
<span class="gate-blip gate-blip--6" aria-hidden="true"></span>
<span class="gate-blip gate-blip--7" aria-hidden="true"></span>
<span class="gate-blip gate-blip--8" aria-hidden="true"></span>
</div>
</div>
</div>
<h1 class="at-gate__title">OffCode: Privacy-Focused Encryption, Security and Automation Software</h1>
<div class="at-hero__rule" aria-hidden="true"></div>
<p class="at-gate__sub">Building privacy-focused software, security tools, automation, and AI solutions.</p>
<p class="at-gate__lead">I build programs for PC and mobile users who want more control: screen lockers, remote control tools, automation, AI-powered applications, and encrypted communication. Everything is made by one developer, with a focus on reliability, transparency, and doing exactly what it says, without unnecessary bloat.</p>
<a class="at-gate__continue" href="#tools" aria-label="Continue to What is on this site">
<span>Continue</span>
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<section id="tools" class="at-section at-section--dark">
<div class="at-section__header">
<h2 class="at-section__title">What is on this site</h2>
<p class="at-section__subtitle">Seven tools covering encryption, device security, automation and
private communication. Each one is documented on its own page, with pricing, requirements
and release notes kept up to date.</p>
</div>
<div class="at-related">
<div class="at-related__item">
<h3><span class="at-icon at-icon--phone" aria-hidden="true"></span> OffCrypt for Android</h3>
<p>Encrypt messages and files on your phone, fully offline. Send self-destructing messages that disappear after reading. Free and open source (GPL-3.0).</p>
<a href="OffCryptAndroid.html" class="at-related__link">View the Android app</a>
</div>
<div class="at-related__item">
<h3><span class="at-icon at-icon--monitor" aria-hidden="true"></span> OffCrypt Desktop for Windows</h3>
<p>Encrypt messages and files on your Windows PC, fully offline. Send disappearing messages, manage contacts and identities, and keep all your data on your own machine.</p>
<a href="OffCryptDesktop.html" class="at-related__link">Explore OffCrypt Desktop</a>
</div>
<div class="at-related__item">
<h3><span class="at-icon at-icon--lock" aria-hidden="true"></span> Screen Lock Builder</h3>
<p>Build your own Windows screen locker without writing code. Set a custom message and password, block Task Manager, and choose when it locks or unlocks. Saved as a portable app you can run anywhere.</p>
<a href="ScreenLockBuilder.html" class="at-related__link">View Screen Lock Builder</a>
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<div class="at-related__item">
<h3><span class="at-icon at-icon--star" aria-hidden="true"></span> Screen Lock Builder Premium</h3>
<p>The extended edition: lock folders, programs and websites, save your settings, use custom themes and remove branding. Includes all future updates. The free version stays fully usable for everyday needs.</p>
<a href="ScreenLockBuilderPremium.html" class="at-related__link">View the Premium Builder</a>
</div>
<div class="at-related__item">
<h3><span class="at-icon at-icon--cpu" aria-hidden="true"></span> Automation Tool</h3>
<p>Automate repetitive tasks on your Windows PC. Describe what you want in plain English, let AI build the script, and run it on a schedule. Reads text on your screen and clicks for you.</p>
<a href="AutomationTool.html" class="at-related__link">View the Automation Tool</a>
</div>
<div class="at-related__item">
<h3><span class="at-icon at-icon--cast" aria-hidden="true"></span> Web Remote Control</h3>
<p>Free, self-hosted remote control for Windows. Watch the live screen, transfer files, manage tasks and open a remote terminal from any browser.</p>
<a href="RemoteControl.html" class="at-related__link">View Web Remote Control</a>
</div>
<div class="at-related__item">
<h3><span class="at-icon at-icon--layers" aria-hidden="true"></span> Tor Chat</h3>
<p>A free, self-hosted chat that runs over the Tor network. Create password-protected or hidden rooms, share one link, and let guests join with only Tor Browser. Messages are encrypted in the browser and expire automatically.</p>
<a href="TorChatPage.html" class="at-related__link">View Tor Chat</a>
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<div class="at-related__item">
<h3><span class="at-icon at-icon--message" aria-hidden="true"></span> Community and support</h3>
<p>A Discord server for support and coding discussion, plus the privacy policy and the
changelogs for every product. Joining the chat is optional, and the email contact
stays available for licensing and GDPR requests.</p>
<a href="Community.html" class="at-related__link">Visit the community</a>
</div>
</div>
</section>
<!-- GEO: selkeät vastattavat kappaleet -->
<section id="faq" class="at-section seo-faq">
<h2>Frequently asked questions</h2>
<div class="seo-faq__list">
<details class="seo-faq__item">
<summary class="seo-faq__q"><h3>Does OffCode software collect telemetry?</h3><span class="seo-faq__chev" aria-hidden="true"></span></summary>
<div class="seo-faq__a">
<p class="seo-faq__lead">The offline apps collect no user data. Paid licences use a hardware ID only for activation.</p>
<ul class="seo-faq__rows">
<li><strong>OffCrypt Android, OffCrypt Desktop, Screen Lock Builder (free)</strong><span>No data collected. Work fully offline and never contact external servers.</span></li>
<li><strong>Screen Lock Builder Premium</strong><span>Collects only your hardware ID (HWID) to activate and verify the licence.</span></li>
<li><strong>Automation Tool</strong><span>Collects no personal data or usage information; automations run locally. The optional AI Script Builder sends your prompt to the LLM provider you choose (or a local Ollama).</span></li>
<li><strong>Web Remote Control, Tor Chat</strong><span>Self-hosted: they run on your own server, and you control hosting and data.</span></li>
</ul>
<p class="seo-faq__more">Details: <a href="PrivacyPolicy.html">Privacy Policy</a>.</p>
</div>
</details>
<details class="seo-faq__item">
<summary class="seo-faq__q"><h3>Which OffCode tools are free?</h3><span class="seo-faq__chev" aria-hidden="true"></span></summary>
<div class="seo-faq__a">
<div class="seo-faq__cols">
<div>
<p class="seo-faq__label">Free</p>
<ul class="seo-faq__list-plain">
<li><strong>OffCrypt for Android</strong> – open source, GPL-3.0</li>
<li><strong>OffCrypt Desktop</strong> – open source, GPL-3.0</li>
<li><strong>Screen Lock Builder</strong> – free version</li>
<li><strong>Web Remote Control</strong> – free, self-hosted</li>
<li><strong>Tor Chat</strong> – free prebuilt binaries, self-hosted</li>
</ul>
</div>
<div>
<p class="seo-faq__label">Paid (one-time, lifetime licence)</p>
<ul class="seo-faq__list-plain">
<li><strong>Screen Lock Builder Premium</strong></li>
<li><strong>Automation Tool</strong></li>
<li><strong>Source code licences</strong> for Web Remote Control and Tor Chat (optional, for developers)</li>
</ul>
</div>
</div>
</div>
</details>
<details class="seo-faq__item">
<summary class="seo-faq__q"><h3>Which platforms are supported?</h3><span class="seo-faq__chev" aria-hidden="true"></span></summary>
<div class="seo-faq__a">
<ul class="seo-faq__rows seo-faq__rows--chips">
<li><strong>OffCrypt for Android</strong><ul class="seo-chips" aria-label="Platforms"><li>Android 5.0+</li></ul></li>
<li><strong>OffCrypt Desktop</strong><ul class="seo-chips" aria-label="Platforms"><li>Windows 10</li><li>Windows 11</li></ul></li>
<li><strong>Screen Lock Builder & Premium</strong><ul class="seo-chips" aria-label="Platforms"><li>Windows 7 / 8 / 10 / 11</li></ul></li>
<li><strong>Automation Tool</strong><ul class="seo-chips" aria-label="Platforms"><li>Windows 10</li><li>Windows 11</li></ul></li>
<li><strong>Web Remote Control</strong><ul class="seo-chips" aria-label="Platforms"><li>Windows agent</li><li>Any browser</li><li>Self-hosted</li></ul></li>
<li><strong>Tor Chat</strong><ul class="seo-chips" aria-label="Platforms"><li>Host: Windows, macOS, Ubuntu Desktop or Docker</li><li>Guests: Tor Browser</li></ul></li>
</ul>
</div>
</details>
</div>
</section>
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<p class="seo-footer__logo">OffCode</p>
<p>Privacy-focused encryption, security and automation software from Finland.</p>
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<p class="seo-footer__h">Contact</p>
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<li><a href="mailto:support@dev-offcode.com">support@dev-offcode.com</a></li>
<li><a href="PrivacyPolicy.html">Who builds OffCode?</a></li>
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<p>© 2026 OffCode (dev-offcode.com) · Independent developer in Finland · Not affiliated with Offcode Oy</p>
<p>Last updated: <time datetime="2026-10-20">20 October 2026</time></p>
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