Security is really hard. For every "obvious" solution there's always going to be a back door. For every known backdoor there's going to be a covert back door which you're not going to be aware of, or a honey trap which looks like a trusted independent solution but is really state owned.
If you want a truly secure solution you're probably going to have to wait for some kind of bio-linked technology where your personal data is embedded in your physical body, and forced access either wipes it, or kills you, or perhaps both, depending on the settings.