Has the internet left every one of us dangerously exposed? HARDtalk's Stephen Sackur speaks to Michael Chertoff, former US Secretary of Homeland Security during the Bush Administration and now a leading thinker on cyber-security. Most of us have embedded the internet and smart technology in our lives. We might like to believe we’re autonomous digital citizens, but what if our behaviours are now being monitored, and modified by private and state actors over which we have no control?

Image: Michael Chertoff (Credit: Getty Images)