Experts in Mobile Device Security

Applied cryptography, security protocols, research, and audits.
Building high level API libraries and usable encryption solutions.

Our Passion

Confidentiality is a very valuable asset - Cotech protects it. We provide end-to-end encryption solutions for mobile devices that provide revocable access to confidential data for companies and individuals. Our design concepts follows usablity on all layers: It is end user and developer friendly.

Our Story

In the beginning there was OpenKeychain, the most widely used OpenPGP implementation for Android. It has been financially supported by the Google Summer of Code program as well as the Open Technology Fund. The software quality has been verified in an external security audit. Now, Cotech - Confidential Technologies GmbH is leading the development.

Our Vision

Cotech relies on open-source software. We believe in free and open solutions. Software must be verifiable and documented. We believe in decentralized message exchange and usable security solutions. This is why we are participating in the Autocrypt project.



Hardware Security SDK

Android SDK with support for Security Keys & Smart Cards over NFC and USB.


OpenPGP key management for Android

OpenPGP/ Autocrypt SDK

Android library with support for OpenPGP, Autocrypt, WKD, and NFC/USB security keys.


OpenKeychain is now maintained by Cotech. OpenKeychain is the most widely used OpenPGP implementation on Android. With OpenKeychain you can easily generate new key pairs and manage the public keys of your contacts. With its great integration in K-9 Mail there is a user-friendly way to send PGP/MIME emails. Besides this, you can execute cryptographic operations, such as signature generation and encryption, manually in OpenKeychain. My favorite feature is the support for security tokens.