How would you create a password that could not be recovered via "human" engineering?

Security is important, especially with one’s own data. Most of us wouldn’t want government or business to be able to track our movements or our health situation or our spending habits. Yet any encryption system requires a password, and you can always be tortured enough to reveal the password.

So, can you think of any way to create a password that would use, say, undecodable random biometric information in combination with volitional information in order to decrypt the data? How would it work? For extra credit, as system, could you think of a way to make the information recoverable upon the death of the person?