As of March 2016 , there are over 1 billion OpenID-enabled accounts on the Internet (see below) and approximately 1,100,934 sites have integrated OpenID consumer support: AOL, Flickr, Google, Amazon.com, Canonical (provider … See more

The OpenID Foundation (OIDF) promotes and enhances the OpenID community and technologies. The OIDF is a non-profit international standards development organization of … See more

The original OpenID authentication protocol was developed in May 2005 by Brad Fitzpatrick, creator of popular community website LiveJournal, while working at See more

Published in February 2014 by the OpenID Foundation, OpenID Connect is the third generation of OpenID technology. It is an authentication layer on top of the OAuth 2.0 authorization framework. It allows computing clients to verify the identity of an end user based … See more

An end user is the entity that wants to assert a particular identity. A relying party (RP) is a web site or application that wants to verify the end user's identifier. Other terms for this party include "service provider" or the now obsolete "consumer". An identity provider, … See more

Authentication bugs
In March, 2012, a research paper reported two generic security issues in OpenID. Both issues allow … See more

OpenID is a way to use a single set of user credentials to access multiple sites, while OAuth facilitates the authorization of one site to access and use information related to the user's account on another site. Although OAuth is not an authentication protocol, it can be … See more