Oauth 2.0 authentication

What is Oauth 2.0
OAuth 2.0 stands for Open Authorization. OAuth is a delegation protocol that allows applications to access resources hosted by other web applications on behalf of a user. OAuth 2.0 is specifically an authorization protocol, not an authentication protocol. Its primary function is to grant access to a set of resources. OAuth 2.0 operates using Access Tokens. An Access Token is a data element that signifies authorization to access resources on behalf of the end-user. OAuth 2.0 does not specify a particular format for Access Tokens.
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Problems with Oauth 1.0
• Basic signature workflow.
• Complex implementation of digital signatures at client-side.
• All transaction will be invalidate if a single message signed improperly.
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The Client initiates an authorization request by contacting the Authorization server, providing the client ID and secret for identification. Additionally, the Client supplies the scopes and a redirect URI (endpoint URI) where the Access Token will be sent.
The Authorization server then authenticates the Client and verifies that the requested scopes are permissible.
The Resource owner engages with the Authorization server to grant access.
Upon successful authorization, the Authorization server redirects back to the Client, returning either an Authorization Code or an Access Token, depending on the grant type, as detailed in the following section. A Refresh Token might also be issued.

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