On the topic of courts: There is a US court case in the 11th circuit where a federal judge, in fact, ruled that people are not required to give up their encryption passwords under the 5th amendment. It isn't a supreme court case however.
http://www.techrepublic.com/blog/tech-manager/personal-data-... "Last week in San Francisco, a federal court for the first time ruled that the Fifth Amendment of the U.S. Constitution — the right to not self-incriminate — protects against “forced decryption.” The judge, from the 11th Circuit in San Francisco, ruled that a Florida court violated a defendant’s rights when its Grand Jury gave him the choice to either reveal his TrueCrypt password or go to jail."
http://www.techrepublic.com/blog/tech-manager/personal-data-... "Last week in San Francisco, a federal court for the first time ruled that the Fifth Amendment of the U.S. Constitution — the right to not self-incriminate — protects against “forced decryption.” The judge, from the 11th Circuit in San Francisco, ruled that a Florida court violated a defendant’s rights when its Grand Jury gave him the choice to either reveal his TrueCrypt password or go to jail."