OpenID - Wikipedia, the free encyclopedia

OpenID is a decentralized single sign-on system. Using OpenID-enabled sites, web users do not need to remember traditional authentication tokens such as username and password. Instead, they only need to be previously registered on a website with an OpenID "identity provider", sometimes called an i-broker. Since OpenID is decentralized, any website can employ OpenID software as a way for users to sign in; OpenID solves the problem without relying on any centralized website to confirm digital identity.

OpenID is increasingly gaining adoption amongst large sites, with organizations like AOL acting as a provider. In addition, integrated OpenID support has been made a high priority in Firefox 3^[1] and Microsoft is working on implementing OpenID 2.0 in Windows Vista.^[2]

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• Yahoo! allows users to use their Yahoo! IDs as OpenIDs starting January 31, 2008.^[43]
• Userstyles.org, the CSS repository for Stylish
• SourceForge
• Google^[44]
• Luxsci is both an OpenID consumer and provider.
• Facebook now allows an existing account to have an OpenID associated as an alternative login method.
• In 2.0 RC1.1, Simple Machines Forum allows the administrator to allow registration using an OpenID.

Some of the companies (especially the biggest ones) which did enable OpenID have been criticized for being a provider of OpenID identities to third-party websites, without being an OpenID consumer and allowing credentials of another website to work with their own websites. (For example, logging into Yahoo through Windows Live credentials).^[45]

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