Editor's Overview
Kryptos is a messaging application developed by datakeeper, packaged as a single Android APK of version 2.3 weighing in at 21.13 MB. The package targets Android 4.1+ and above. Below you'll find the publisher's own description, a quick spec sheet, and a short buyer-beware checklist so you know exactly what you're installing before tapping download.
Install Checklist
- Only download through the button on this page — never from third-party mirrors or shortened links, which are the most common way malware spreads.
- File size is a light 21.13 MB, so it installs quickly even on modest connections.
- This build is signed by "datakeeper" — always verify the developer name matches what's listed on the app's official store page before installing an update.
- After install, Android may prompt you to allow "Install from unknown sources" — approve only this one install, then revoke the permission in Settings > Apps > Special access.
- We link directly to the APK file or the publisher's repository; we do not modify the binary. Always run a virus scan after any sideloaded install.
About this app
The Kryptos keyboard installs like any other system keyboard: enable it once, and it will be available everywhere you type. Write a message in WhatsApp, Telegram, or SMS, tap the lock icon, and the text in the input field is instantly replaced with ciphertext ready to send. Incoming messages are decrypted automatically, directly on top of the chat as you scroll, with no copying or app switching required. Both the keyboard and on-screen decryption are built into the system, so they work in any app.
Encryption: the Signal Protocol, powered by the official Signal libsignal library, a new key for every message, and protection against future quantum computers. Contacts can be verified using a safety code. If a full chat protocol is more than you need, there is a simple mode based on a shared password. PGP is also built in for users who rely on it. To the messenger, the encrypted message looks like nothing more than a meaningless string of characters with no recognizable markers.
Steganography hides the very fact that a message was written. Encrypted text can be hidden inside an ordinary photo or disguised as a harmless-looking sequence of real words. Without the password, the hidden content cannot be extracted from the image.
Nothing connects to the internet: the app contains no networking code. Kryptos requests only the permissions it needs for QR code scanning, vibration, and overlay functionality. No accounts, phone numbers, servers, or analytics. Keys are generated directly on the device, stored in Android’s secure keystore, and never leave it.
Access to the app can be protected with biometrics or a password. There is also a panic-wipe password: entering it into the same password field permanently deletes all stored data. The clipboard is cleared automatically, messages can be set to disappear after a timer, and screenshots and the app preview in the recent-apps screen can be blocked. All your keys can also be exported to a single password-protected file for transfer to a new phone.
Also included: light and dark themes, multiple app languages, a step-by-step guide with answers to frequently asked questions, emoji support, and fully offline autocorrect for English, Russian, German, and Persian, plus pinyin input for Chinese.
Details
| Version | v2.3 |
|---|---|
| Size | 21.13 MB |
| Developer | datakeeper |
| Category | Messaging |
| Package | com.kryptos.android |
| Android | 4.1+ |
| Last Updated | Oct 29, 2026 |
| Downloads | 7 |
Frequently Asked Questions
Is Kryptos free to download?
Yes. The APK file linked from this page is free. The developer may offer in-app purchases once installed, but obtaining the installer itself costs nothing.
What Android version does Kryptos require?
Android 4.1+ or newer. Installing on older devices may cause crashes or refuse to install.
Is Kryptos safe to install?
We link to the exact APK published by datakeeper. We do not modify the file. Still, as with any sideloaded app, scan it with a reputable antivirus before opening it, and only grant permissions the app genuinely needs.
How do I update Kryptos?
Install the newer version on top of the old one — Android will keep your data. If the signature differs, uninstall first (you may lose local progress).
Why is the app not installing?
Common causes: not enough storage, an older Android version than 4.1+, or a conflicting build already installed. Free up space, check your OS version, and uninstall any previous copy before retrying.
How to Download & Install Kryptos
- Tap the Download APK button above and save the file to your device.
- Open your device Settings → Security (or Apps → Special access → Install unknown apps) and allow your file manager or browser to install unknown apps for this one file only.
- Open the downloaded
com.kryptos.android.apkfile from your Downloads folder. - Tap Install and wait for Android to finish.
- Open «Kryptos» by datakeeper and grant only the permissions it actually needs.
- Revoke the "unknown sources" permission once you are done installing.
Note: this page hosts or links to the installer only. The application name, icon and description are provided for identification. All trademarks belong to their respective owners.
