At WWDC 2019, Apple introduced a button to sign in with Apple. The company claims that this is a secure and confidential authentication method, but the OpenID Foundation does not agree with it.
The OpenID Foundation, a nonprofit organization that develops an authentication system of the same name, sent an open letter to Craig Federigi, senior vice president of software engineering at Apple.
The OpenID Connect protocol was developed by several large companies at once. It is used by Google, Facebook, Microsoft, PayPal and many others.
The letter says that Apple has used many of the features of OpenID, but there are noticeable differences between Sign in with Apple and OpenID Connect . They create security and privacy risks to users.
To solve these problems, the organization calls on Apple to resolve all inconsistencies between Sign in with Apple and OpenID Connect, and also to publicly state that the Apple button is compatible with OpenID Connect.