Should a judge be able to force you to decrypt your laptop?

The only question is a conceptual one: Is a computer a metaphysical vessel containing the essence of a person's more private self, the revelation of which would inevitably lead to a conviction for the dark secrets each of us hides from the world?

Or is it a machine holding letters, documents and data that happen to be stored in digital form rather than on paper, that should be opened with the forced cooperation of the defendant to keep from giving criminals an unassailable hiding place for dark secrets that really should lead to convictions?