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Download & Full Version

RotorCrypt X
download & buy

Try the shareware for free, or unlock all 50 rotors with the full version — one-time payment, no subscriptions, no cloud.

Demo
▶ DEMO
Shareware
Windows & Android
free
0 €
Free forever — no registration needed
  • 3 rotors (same as the original 1939 Enigma)
  • AES-256-GCM + HKDF-SHA3-256
  • Handshake system
  • 10 languages
  • No cloud, no server
  • Windows 10/11 (64-bit) · ZIP file · just extract & run, lah
  • Android 8.0+ · via Google Play
  • Messages with more than 3 rotors cannot be decrypted
Windows 10/11 Download Google Play
Windows Demo
▶ DEMO
Recommended
Full Version
Windows
Full Version
4,50 €
One-time payment · Lifetime licence · Windows 10/11
  • Up to 50 rotors — maximum security
  • 2768 possible key combinations
  • AES-256-GCM + HKDF-SHA3-256
  • Handshake system
  • 10 languages
  • All future updates included
  • licence key by email
Buy now — €4.50 via PayPal
Android Demo
▶ DEMO
Full Version
Android
Full Version
4,49 €
One-time payment · Lifetime licence · Android 8.0+
  • Up to 50 rotors — maximum security
  • 2768 possible key combinations
  • AES-256-GCM + HKDF-SHA3-256
  • Handshake system
  • 10 languages
  • All future updates included
  • licence key by email
Buy now — €4.49 via PayPal
HOW THE PURCHASE WORKS

1. Click "Buy now" → the PayPal page will open
2. Transfer €4.50 (Windows) or €4.49 (Android) — please state your email address and Windows or Android in the payment reference
3. You'll receive your own personal licence key by email
4. Open the app → Settings → Activate Licence → enter the key → done, that's it

The licence key is valid for one device (Windows or Android). If you switch devices, just drop us a short email, no problem one. Full version and shareware use the same keyfile format — desktop and mobile are compatible.
Security

Why more rotors?

The original Enigma machine worked with 3 rotors and it got cracked. With RotorCrypt X and up to 50 rotors, the key space grows exponentially. The result: 2768 possible key combinations — combined with AES-256-GCM and HKDF-SHA3-256, practically unbreakable.

3
Shareware — free
Same as the original Enigma. Safer than 1939 thanks to the AES layers — but not quite enough for maximum protection.
…
Freely selectable
Every extra rotor multiplies the key space. You decide how much security you need.
50
Full Version — €4.49
2768 possible key combinations. AES-256-GCM + HKDF-SHA3-256: quantum-resistant security.
Version History

Release History

September 2025 – present · Desktop (Windows) & Mobile (Android)

🖥 RotorCrypt X — Desktop (Windows)
VersionDateTypeChanges
v2.1.3.1Sep 2026NEUAdded 10 new languages. Auto-lock is now configurable.
v1.9.0.1Aug 2026SECClosed a security gap in the key exchange (man-in-the-middle protection). Fixed many program crashes caused by faulty popup focus logic.
v1.8.8Jun 2026SECIncreased password security: Argon2id raised to 256 MB — maximum password hardening. Improved login encryption. Optimised rotor-count logic.
v1.8.7Mai 2026SECIntroduced password hardening via Argon2id – brute-force attacks practically impossible. Cryptographic key exchange via a shared key per contact.
v1.8.5Apr 2026FIXFixed known bugs from v1.8.0. Stabilised the GUI layer, optimised the keyfile parser. Now also protected with a password.
v1.8.0Mär 2026RELEASEFirst public release. All core features stable. Keyfile format finalised and compatible with the mobile version.
v1.7.5.0Dez 2025VERBComplete documentation of all security mechanisms. Finalised the installer-free ZIP distribution.
v1.7.0.0Nov 2025NEURotor count increased to 50. Multilingual support (10 languages). Export control compliance checked and documented.
v1.6.2.0Okt 2025FIXSecured licence validation against corrupted key files. Fixed GUI display errors on Windows 11 24H2.
v1.6.0.0Sep 2025NEURotor count increased to 25. Flipboard animations in the GUI. Integrated the licence system (shareware / full version).
v1.5.4.0Aug 2025SECNIST SP 800-88 three-pass overwrite when deleting keys. No plaintext remains in memory.
v1.5.0.0Aug 2025NEUContact management with AES-256-GCM encrypted contact names. Implemented anti-debug protection for Windows.
v1.4.3.0Jul 2025FIXFixed Unicode display errors for RTL languages. Stabilised emoji encoding in encrypted texts.
v1.4.0.0Jul 2025NEUFull Unicode support (65,536 characters, including CJK, Arabic, Cyrillic). Rotor count increased to 10.
v1.3.2.0Jun 2025VERBPerformance optimisation of the HKDF derivation. Encryption time for large messages reduced by 40%.
v1.3.0.0Jun 2025SECIntroduced HKDF-SHA3-256 as a third security layer. Key derivation fully switched to a Keccak-based approach.
v1.2.5.0Mai 2025FIXFixed GCM tag verification for special characters. Closed a memory leak in the rotor engine.
v1.2.0.0Mai 2025SECIntegrated AES-256-GCM as a second encryption layer. Authenticated encryption prevents tampering.
v1.1.3.0Apr 2025FIXFixed a rotor-stepping error for long messages. Secured keyfile parsing against corrupted files.
v1.1.0.0Apr 2025NEUIntroduced the keyfile system (binary format, 13,600 bytes). Implemented the first handshake algorithm.
v1.0.5.0Mär 2025VERBImplemented the first graphical interface. Stabilised rotor logic, extended the character set to ASCII.
v1.0.0.0Mär 2025NEUFirst internal concept and basic architecture. Rotor engine with 3 rotors, first implementation of the encryption logic.
📱 RotorCrypt X Mobile — Android
VersionDateTypeChanges
v1.8.1Jun 2026FIX/SECFixed biometric login — reliable Keystore storage. Argon2id 256 MB. Device switching supported. Help text refined across 10 languages.
v1.8.0 ▸Mai 2026RELEASECurrent public release. Full compatibility with Desktop v1.8.8 confirmed. Available on Google Play.
v1.7.5.0Mär 2026FIXPassword validation popup: all 7 conditions now shown correctly in green/white. Biometric toast on desktop disabled.
v1.7.0.0Mär 2026VERBOptimised UI contrast. Replaced MDCheckbox with a Canvas drawing. Replaced all emoji icons with Material Icons.
v1.6.3.0Feb 2026FIXFixed a navigation bug (contact settings were bleeding into global settings). Password-change overlay now closes correctly.
v1.6.0.0Jan 2026NEUShareware decrypt-blocking for messages with more than 3 rotors. Copy button configurable with messenger name.
v1.5.0.0Dez 2025SECRemoved all print() outputs (7,182 lines reviewed). Logging reduced to ERROR level. No plaintext in logs.
v1.4.2.0Nov 2025FIXStabilised language switching without needing to log in again. Removed duplicate licence UI sections. Fixed the wrong language showing in the licence dialog.
v1.4.0.0Nov 2025NEUSupport for 10 languages. System language detection on startup. All UI text stored multilingually in _UI-Dictionary.
v1.3.5.0Okt 2025VERBCompletely reworked the avatar system. Improved the crop overlay, optimised the Canvas drawing. Enabled screenshot protection.
v1.3.0.0Sep 2025NEUImplemented the licence manager for mobile. Separate _LIC_MASTER — desktop and mobile licences are not interchangeable.
v1.2.3.0Aug 2025FIXFixed an HMAC error in desktop-to-mobile decryption. Corrected rotor swipe direction (up = larger number).
v1.2.0.0Aug 2025NEUFully ported the handshake system. Slot-64 bootstrap-key mechanism. Keyfile compatibility with desktop verified.
v1.1.4.0Jul 2025SECSecurityManager with PBKDF2-HMAC-SHA256 (100,000 iterations). AES-256-GCM for all stored data.
v1.1.0.0Jul 2025NEUFirst working UI on Android. Implemented contact management, avatar system, and SHA3-256-hashed filenames.
v1.0.3.0Jun 2025FIXFixed a critical bug in the HKDF derivation (a wrong parameter call was breaking desktop compatibility). Replaced null-byte padding with random bytes.
v1.0.0.0Jun 2025NEUKicked off the mobile project. Compatibility with the desktop keyfile format set as the main goal.
Legend: NEUNew Feature  FIXBug Fix  SECSecurity  VERBImprovement  RELEASEPublic Release