I need to implement a web-based authentication protocol so users I know can be given access to a third-party web application. I will work with the developers of that web application to implement both sides, since they currently do not support authentication delegation.
At first, I thought I would implement an OpenID 2.0 IdP, since I thing the protocol is simple and well-designed. But the other developer feels concerned that OpenID 2.0 is considered obsolete, and thinks we should rather use the newer OpenID Connect…
Given that we have no need for authorization delegation that OAuth might provide, OpenID Connect looks bloated to me.
So, should I consider it is dangerous to deploy the obsolete OpenID 2.0 now and choose OpenID Connect or should I insist on using the older and simpler OpenID 2.0 protocol?
And if I should choose OpenID Connect, is there a good reason not to use the implicit flow (with “response_mode” set to “query”)? I’d rather avoid the extra server-to-server round-trip that looks useless to me, for a protocol that only provides identity…
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