The problem with encryption is that, as far as I'm aware, it doesn't hide the sender/recipient information. You might not be able to read the content, but intelligence agencies are just as interested in who is communicating with whom as they are in the content of the messages.

Oh, and we have a law in the UK which makes it a criminal offence, punishable by 2-5 years in prison, to refuse to hand over the private key so that your data can be decrypted. :(