China almost triples its number of supercomputers according to a reputable list of the world's most powerful machines - but the US sees its numbers fall.

Islamic State militants want to launch major cyber-attacks on UK targets like hospitals and air traffic control, the chancellor says.

Anonymous is promising its "biggest operation ever" against Islamic State militants after the Paris attacks.

Do militant groups use encryption to communicate, and, if so, what can the security services do?

Rory Cellan-Jones speaks to the hackers collective about their plans to take on so-called Islamic State.

Sky has warned some of its customers they are likely to receive letters demanding cash for illegally downloaded pornographic films.