[vonmoltke]

> Basically your phone goes from being personal property that can be used against you as evidence to an extension of your mind that is now subject to 5th amendment protection.

Actually, it does not go that far. The 5th Amendment protects people from being forced to inciminate themselves. Otherwise, a person could be charged with contempt of court, obstruction of justice, or similar crimes. Someone who refuses to decrypt their data when subject to a warrant will face that penalty, just like someone who refuses to answer a subpeona or destroys documents relevant to a counrt case.