I think a good strategy for anyone who may potentially have to go through this situation is to roll your own encryptor/encoder to combine several sets of data in to a single dataset, and having multiple keys associated with it. Depending on which key you use, you will get a different output. From the outside it will look like a simple way to disguise a already encrypted dataset.<p>A decoy in simple.
The fact that the UK government has a <i>Chief Surveillance Commissioner</i> alone speaks volumes. I wonder when they introduce the <i>ministry of truth</i> - it can only be a matter of time.