PGPAuth is an App to send PGP signed requests to servers.
Currently the actions to send are hardcoded to "open" and "close", but this is planned to be configurable on the server. If you want this feature, please comment in #3.
The smartphones having this app installed need direct access to the server in question. Communication is done over HTTP(S).
Requests are POSTed to the server. For details, please look at the reference implementation at https://github.com/PGPAuth/PGPAuth_CGI.