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Is there anything akin to a federated forum login?
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I think one issue is that it might be hard to keep a malicious server owner from sniffing or phishing your creds. I guess the big commercial SSO systems depend on companies being large enough to afford it, as a filter for fly-by-night operations.
It's really easy because the site you're logging into never gets creds. It gets a cryptographic signature it can check against a public key.
That's true if the form the user sees is actually the one they expect to see from their SSO origin server