Twenty-five years after the world wide web was created, it is now caught in the greatest controversy of its existence - surveillance. With many concerned that governments and corporations can monitor our every move, Horizon meets the hackers and scientists whose technology is fighting back. It is a controversial technology, and some law enforcement officers believe it is leading to risk-free crime on the dark web - a place where almost anything can be bought, from guns and drugs to credit card details.
Did You Know?
Amanda Drew - Narrator
Inside are smart cards. When the three are put together, a master code can be validated which resets the system for millions of websites.