This is the irreducible problem. It's the Emperor's New Clothes™. So either the secrets get generated and stored in tamper-protected hardware, or they are store

This is the irreducible problem. It's the Emperor's New Clothes™. So either the secrets get generated and stored in tamper-protected hardware, or they are stored somewhere else that can be made portable. For the latter, then they ought to be serializable into some standard form.