For the purposes of quick and simple authentication of users on several logically united websites, the Pancodix team has developed the Sphinx webservice.
Sphinx is made as a webservice, oriented for maximally quick request processing, so that the authentication with Sphinx works so quickly as if it is the part of the "host" website, even if it is installed on a remote server.
The widget with the standard authentication functionality is embedded into a site-client. For example:
The widget accepts the user's authentication request, displays the actual authentication information, provides the possibility of authentication through popular social networks. The backend module of the widget accomplish the data exchange with the Sphinx-service.
The service stores the information about users, processes the registration requests, sign-ins, password changes and so on, and returns to a site-client its specifically encrypted replies.