Bruce Schneier: “What you’re asking is much more narrow: won’t terrorists be able to use encryption to protect their secrets? Of course they will. Like so many other aspects of our society, the benefits of encryption are general and can be enjoyed by both the good guys and the bad guys. Automobiles benefit both long-distance travelers and bank robbers. Telephones benefit both distant relatives and kidnappers.”
Read more: http://uk.businessinsider.com/bruce-schneier-david-cameron-proposed-encryption-ban-destroy-the-internet-2015-7