What is your plan for when the judge tells you to supply the decryption key?
They then need to go back to the judge, and get a court order to compel you to supply your encryption key. By which time you've gotten a lawyer, and can fight back.
I don't do anything remotely heinous enough to warrant a court order to reveal my encryption key, however.
Um...that kid in Tennessee that accessed Sarah Palin's email did a secure erase, but enough of his activity was revealed by some malware on his machine, as well as ISP records etc., that he also got charged with obstruction of justice for having deleted stuff germane to the crime of unauthorized access. Just sayin'.