All Projects → Nutomic → Ensichat

Nutomic / Ensichat

Licence: mpl-2.0
Project discontinued

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Unfortunately, I won't be able to continue development on Ensichat, due to lack of time. I suggest you give Briar a try instead.

If you wish to take over maintenance of the project, please contact me.


Build Status License: MPLv2

Instant messenger for Android that is fully decentralized, and uses strong end-to-end encryption. Messages are sent directly between devices via Bluetooth or Internet, without any central server. Relay nodes are used to ensure message delivery, even if the target node is offline.

For details on how Ensichat works, you can check out my bachelor thesis, and read the protocol definition.

screenshot 1 screenshot 2 screenshot 3

Get it on Google Play Get it on F-Droid

To set up a server, please follow the instructions on the wiki.


To setup a development environment, just install Android Studio and import the project.

Alternatively, you can use the command line. To create a debug apk, run ./gradlew assembleDevDebug. This requires at least Android Lollipop on your development device. If you don't have 5.0 or higher, you have to use ./gradlew assembleRelDebug. However, this results in considerably slower incremental builds. To create a release apk, run ./gradlew assembleRelRelease.


You can run the unit tests with ./gradlew test. After connecting an Android device, you can run the Android tests with ./gradlew connectedDevDebugAndroidTest (or ./gradlew connectedRelDebugAndroidTest if your Android version is lower than 5.0).

To run integration tests for the core module, use ./gradlew integration:run. If this fails (or is very slow), try changing the value of Crypto#PublicKeySize to 512 (in the core module).


The project is licensed under the MPLv2.

The launcher icon is based on the Bubbles Icon created by Paomedia which is available under CC BY 3.0.

Note that the project description data, including the texts, logos, images, and/or trademarks, for each open source project belongs to its rightful owner. If you wish to add or remove any projects, please contact us at [email protected].