Oh not again
Brave talk Cameron, but unless you want to award the United Kingdom junk bond status in the world of commerce you should really engage brain before opening mouth. Not everyone who uses encryption is a terrorist or a paedophile - in fact, most are absolutely not. No one trusts governments anymore, and for good reason. Making everyone sensible an outlaw means you will only have the halfwits and the dimwits left on your side - really, really not a good place to be. Work out a way to quietly retract your words - start now BEFORE you face the electorate.