A central idea in The Code Book is the concern that much of the world’s information is not secure. Which lines from the passage best support this central idea? Check all that apply.

it could be that the laws of mathematics forbid the existence of a significant shortcut
only a small fraction of the information flowing around the world is securely encrypted
companies are already supplying shielding material that can be used to line the walls of a room
few of these people take adequate precautions in terms of privacy
law enforcers and anybody else with a curious mind can get their hands on more information