What does OpenID provide?Digital signaturesCertificate signingAuthentication delegation

OpenID provides Authentication Delegation. This means it allows you to use an existing account to sign in to multiple websites, without needing to create new passwords.

Here's a step-by-step explanation:

1. OpenID is a protocol that allows users to be authenticated in a decentralized manner. It eliminates the need for webmasters to provide their own ad hoc login systems, and allows users to log in to multiple unrelated websites without having to have a separate identity and password for each.

2. The user can choose to use an OpenID provider to log in to a website that supports OpenID authentication. The OpenID provider is responsible for verifying the user's identity.

3. The website will then trust the OpenID provider to do the authentication. This is known as authentication delegation.

4. OpenID does not provide digital signatures or certificate signing. These are separate technologies used for verifying the authenticity of digital information.

5. Digital signatures are used to verify that a digital document or a message is authentic, while certificate signing is used to verify the authenticity of a digital certificate.

6. OpenID, on the other hand, is purely about authentication delegation. It's about proving that a user is who they say they are, not about verifying the authenticity of digital information.