The notorious hacktivist collective Anonymous has targeted everyone from PayPal to the FBI. But a string of arrests have crippled the group. So who is Anonymous now?

Sony Pictures was hacked and the U.S. blamed North Korea. But the government's evidence wasn't all that convincing, and many hackers and computer experts still have doubts.

Authoritarian regimes are using spyware tools bought from private companies in the West. Hacker PhineasFisher targeted these companies to reveal their deals to suppress dissent.

From Google to the government, China has hacked many American networks. But there's a difference between spying and stealing intellectual property.

On the frontlines of one of the world's bloodiest conflicts, a parallel war is being fought in cyberspace. Is Syria's cyber battlefield creating a model for the wars of the future?

Stuxnet was a sophisticated cyber attack on an Iranian nuclear plant that may have changed the nature of warfare forever.

As Iran ramps up its offensive cyber operations, American critical infrastructure is increasingly vulnerable to attacks.

Tailored Access Operations, or TAO, is the NSA's elite hacking force. TAO employs some of America's best hackers - so who are their targets?

Zero days are bugs in software that hackers use to break into systems. Some are valued at up to a million dollars, with both buyers and sellers shrouded in secrecy.

Anonymous declares war on ISIS. But when Anonymous members share intel with the government it fractures the hacktivist collective.

After Ashley Madison, a hook-up site for married people, got hacked, its users weren't the only ones exposed. Turns out the cheating site may have been cheating its own customers.

Israel is one of the world's cyber super powers. So how did this tiny nation grow so strong - and who is it targeting?

A cyber attack on Ukraine's power grid leaves thousands of people in the dark. As a military conflict involving Russia rages in the east, has the ground war led to cyberwar?

Russian cybercrime is big business - and some say hackers get a pass when they work double duty for Putin and his geopolitical ambitions.

The wars of the future might be fought with autonomous machines, drones and weapons that can act on their own. But is it ever OK to write code that can kill?

From self-driving cars to Siri, a race is on to build more powerful AI. But some warn we could be programming our own extinction.