to become more attractive; for example MIT, the originator of Kerberos, now supports OpenID Connect.

Email address

Single sign-on in theory can work without revealing identifying information such as email addresses to the relying party (credential consumer), but many credential providers do not allow users to configure what information is passed on to the credential consumer. As of 2019, Google and Facebook sign-in do not require users to share email addresses with the credential consumer.

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