OpenID is a decentralized authentication protocol that makes it easy for people to sign up and access web accounts.
Yahoo, Google and facebook are all OpenID providers, so simply implementing it on your site will be enough for your users to be able to login using them
OpenID allows you to use an existing account to sign in to multiple websites, without needing to create new passwords.
You may choose to associate information with your OpenID that can be shared with the websites you visit, such as a name or email address. With OpenID, you control how much of that information is shared with the websites you visit.
With OpenID, your password is only given to your identity provider, and that provider then confirms your identity to the websites you visit. Other than your provider, no website ever sees your password, so you don’t need to worry about an unscrupulous or insecure website compromising your identity.
Source: http://openid.net/get-an-openid/what-is-openid/
Spring security 3 - OpenId Login with Google Provider also posible
Yahoo, Google and facebook are all OpenID providers, so simply implementing it on your site will be enough for your users to be able to login using them
OpenID allows you to use an existing account to sign in to multiple websites, without needing to create new passwords.
You may choose to associate information with your OpenID that can be shared with the websites you visit, such as a name or email address. With OpenID, you control how much of that information is shared with the websites you visit.
With OpenID, your password is only given to your identity provider, and that provider then confirms your identity to the websites you visit. Other than your provider, no website ever sees your password, so you don’t need to worry about an unscrupulous or insecure website compromising your identity.
Source: http://openid.net/get-an-openid/what-is-openid/
Spring security 3 - OpenId Login with Google Provider also posible
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