KryptEY

7 Downloads 13 Views v0.1 16.63 MB 4.1+

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(16.63 MB)

Editor's Overview

KryptEY is a keyboard & ime application developed by amnesica, packaged as a single Android APK of version 0.1 weighing in at 16.63 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 16.63 MB, so it installs quickly even on modest connections.
This build is signed by "amnesica" — 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

Communicate securely and independent, regardless of the legal situation or whether messengers use E2EE. No server needed. #ChatKontrolleStoppen

Why KryptEY?
Breaking of end-to-end encryption (E2EE) by laws such as the planned EU chat control is an ongoing issue. Content in messengers that use E2EE, such as Whatsapp or Signal, could thus be monitored by third parties. E2EE is often, but not always, standard in messengers. There are proven methods for E2EE such as PGP. However, these methods are sometimes cumbersomely integrated and require a lot of effort to use.

KryptEY is an Android keyboard that implements the Signal protocol. The keyboard works messenger-independently and both the X3DH Key Agreement Protocol and the Double Ratchet Algorithm work without a server, thus it enables a highly independent use of the protocol.

Features
Based upon Simple Keyboard ( https://github.com/rkkr/simple-keyboard ), KryptEY adds a view above the Keyboard for the E2EE functionality.

* use E2EE through Signal Protocol in any messenger
* encryption/decryption of messages
* enter message through separate text field in keyboard
* use clipboard to read messages
* manage contacts in own contact list in keyboard
* message log to view sent/received messages
* send messages as plain JSON (raw mode) or hidden in a decoy text (fairytale mode)
* verification of E2EE functionality via fingerprint
* Q&A View for questions
* dark & light theme

See https://github.com/amnesica/KryptEY/blob/master/KRYPTEY.md for further information on how KryptEY is working.

Security
The existing security properties for the Signal Protocol are also valid for the keyboard.

Limitations
The keyboard was designed as a POC and only allows 1-to-1 conversations. However, the application can also be used in a group chat to a limited extent. Here, a message can be directed to a specific chat partner and not to all people. Other participants of the group chat cannot decrypt the message.

Text messages in Telegram are getting copied as HTML and not as plain text. When decoding the message with the fairytale mode the copied message is compromised and can't be read properly. Therefore, it can't be decoded at all. However, the raw mode works properly. When using KryptEY with Telegram we recommend the raw mode.

Some messengers like Threema only allows up to 3500 bytes per message. Therefore, different character input limitations apply. To stay under the 3500 bytes limit, only 500 characters are allowed for raw and fairytale mode. For convenience these limitation applies for all messengers.

Demo
For a demonstration on how KryptEY is used see https://github.com/amnesica/KryptEY/tree/master#demo

KryptEY was created by mellitopia and amnesica. The code is open source and can be found at https://github.com/amnesica/KryptEY

Details

Version	v0.1
Size	16.63 MB
Developer	amnesica
Category	Keyboard & IME
Package	com.amnesica.kryptey
Android	4.1+
Last Updated	Oct 28, 2026
Downloads	7

Frequently Asked Questions

Is KryptEY 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 KryptEY require?
Android 4.1+ or newer. Installing on older devices may cause crashes or refuse to install.

Is KryptEY safe to install?
We link to the exact APK published by amnesica. 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 KryptEY?
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 KryptEY

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.amnesica.kryptey.apk file from your Downloads folder.
Tap Install and wait for Android to finish.
Open «KryptEY» by amnesica 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.