The difference between OAuth protocol and OpenID Protocol

OAuth focuses on authorization, while OpenID focuses on authentication. On the face of it, these two English words are easy to confuse, but in fact, their meanings are fundamentally different:

• Authorization:n. Authorization, recognition, approval, appointment

• Authentication:n. To prove or identify; confirm.

OAuth is concerned with authorization, that is, "what the user can do", and OpenID is concerned with the proof that: "Who the user is".

If the meaning of OAuth and OpenID is confused, the consequences are serious. Take the application of a domestic website development as an example: its function is to allow Sina Weibo and watercress users to use their own identity to comment, as shown in (the wrong use of OAuth as OpenID):

This type of application is a proof of identity problem, which should have been achieved through OpenID, but because of the erroneous use of OAuth, which poses a security risk : Imagine that the user just posted a comment on the site, but gave the site the freedom to manipulate their own private data! This is like: Courier sent parcels, in order to prove the identity of the recipient, you just give him a look at the identity card can, but you have the security door key to him! Oh,my god!

The difference between OAuth protocol and OpenID Protocol