Thousands of cyberattacks occur every single day. Some hackers steal credit card details or pilfer money from online bank accounts. Others cripple businesses, or even governments. As tensions mount in cyberspace, what are countries doing to strengthen their cyber power and build a hacking army? In this Inquiry, we delve into some of the world’s most intriguing cyber operations – including Iran, Russia and North Korea.

(Black Hat DEF CON cybersecurity conference in Las Vegas, Nevada USA. Photo Credit: Ann Hermes/Getty images),