OpenID – Wikipedia, the free encyclopedia
OpenID is an open, decentralized standard for user authentication and access control, allowing users to log onto many services with the same digital identity. As such, it replaces the common login process that uses a login-name and a password, by allowing a user to log in once and gain access to the resources of multiple software systems.
An OpenID is in the form of a unique URL, and is authenticated by the user’s ‘OpenID provider’ (that is, the entity hosting their OpenID URL). The OpenID protocol does not rely on a central authority to authenticate a user’s identity. Since neither the OpenID protocol nor Web sites requiring identification may mandate a specific type of authentication, non-standard forms of authentication can be used, such as smart cards, biometrics, or ordinary passwords.
OpenID authentication is used and provided by several large websites. Organizations like AOL, BBC, Google, IBM, Microsoft, MySpace, Orange, PayPal, VeriSign, Yandex, Ustream and Yahoo! act as providers.
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