This software has been created at Battlehack Berlin 2015 in 24 hours. So, there might be dragons.
It is not maintained, but might be a good reference for the following topics:
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JavaScript:
- Usage of OpenPGP.js for key generation, encryption and decryption.
- Usage of the crypto.js library
- Writing a JavaScript-client for a RESTful API
-
PHP:
- Writing a RESTful API with the Slim framework.
Private Circle makes it easy to communicate end-to-end encrypted in a small group of people. Setup your own private circle and invite the people you need to securely communicate with.
Please note that this software is experimental.