Cross platform identity, single sign-on

[mariha]

[Draft]

authentication and authorization in the fediverse

• users can sign in on one platform and see hosts in other platforms
• users can chat with others across platforms
• ...

https://socialhub.activitypub.rocks/t/demo-federated-authentication-and-content-addressing/874 https://socialhub.activitypub.rocks/t/single-sign-on-for-fediverse/712 https://socialhub.activitypub.rocks/t/federating-authentication/823

https://www.w3.org/wiki/SocialCG/ActivityPub/Authentication_Authorization

[aschrijver]

Note that both scenario's listed do not require SSO. Taking WarmShowers as an example, and assuming basic level of interoperbility to other platforms than WS..

Scenario: See hosts in other platforms:

• Host Profiles could be federated and each instance might collect them. They contain the Host actor URL.
• New Members themselves might be announced by federation so other instances can track them.
• Instances might be able to request Member collections from other instances.

Scenario: Chat across platforms

• This is what you do on Microblogging fediverse, e.g. when DM'ing between a Pleroma and Mastodon user.