Does the Fifth Amendment Protect Your Encryption?

Good question posed in this CNET article about whether you can be compelled by prosecutors to turn over the keys for encrypted data they want to use against you.  Is this a violation of the Fifth Amendment's prohibition of requiring a defendant to testify against themselves, or not?

Not surprisingly, the Obama administration's Justice Department says "Yes, we should be able to compel you do to this."  Well ... a little surprisingly, come on Obama.  Without protecting this, there is virtually no protection left in the Fifth Amendment as move forward to more and more of our lives being preserved in digital form.