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by viraptor 1550 days ago
Those are not the only options. You can still do TOFU (which is effectively what WA does) as long as you share the keys and encoding - only the wrappers need to be translated. (and the message contents need to be adapted to the client of course) This doesn't break E2E unless the companies involved really want to do that.

E2E does not depend on SSO between the networks.