Typically Single Sign On is implemented with existing protocols like SAML or OAuth. If all the sites belongs to the same parent domain such as a.example.com and b.example.com, we can also set a session cookie for example.com domain for SSO. I understand that typical SSO solutions can cross domains, but in terms of security (instead of functionality), how is this pure-cookies naive solution compared to those protocols like OAuth or SAML? Which one is safer, and why?


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