Cyber-warfare

North Korea suffers an internet outage for several hours before links were restored on Tuesday, but the US government refuses to say whether it is responsible.

Sony Pictures u-turns on its decision to pull parody film The Interview following a cyber attack blamed on North Korea – and now wants it released in cinemas on Christmas day.

North Korea threatens the United States, calling it a “cesspool of terrorism” and accusing the Obama administration of being behind the satirical film The Interview.

Everyone in business “has to be worried” about the cyber threat, if a country under strict sanctions like North Korea can force Sony to pull a film, says Lionel Barber, editor of the Financial Times.

Sony has had to beef up security after several unreleased movies found their way onto the internet. North Korea is prime suspect – but is not denying a hack. (Map from Snoopall, developed by Norse.)

Hackers who attacked PlayStation gaming servers and grounded a plane have told Channel 4 News that, contrary to media reports, they are not linked to Islamic State jihadists and are based in the US.

The US government is searching for a social media monitoring system that can detect sarcasm. What exactly are they worried about?

Search for “Tiananmen Square” on Chinese social media and you will usually draw a blank. But China’s online community have adopted unconventional strategies to talk about the massacre 25 years ago.

Cyber crime expert Don Smith shows Channel 4 News how criminals remotely get into your computer (“they almost certainly have better access to your computer than you do”) in order to steal “hard cash”.

Cyber attacks against Ukraine carry worrying echoes of Russia’s 2008 invasion of Georgia. Is this the new way to wage war?

A cyber attack on Ukraine from inside the Russian-controlled Crimea region has hit the mobile phones of its members of parliament, the head of the country’s security service says.

As military top brass warn of an obsession with “exquisite” equipment and the RAF opens up UK drone HQ, Channel 4 News asks if the next generation of battles will be fought not by man, but by machine.

Tooman Hendrik Ilves tells Channel 4 News about his plans for a European cloud server and admits he is not worried about his emails being intercepted.

Don’t open that email attachment! The UK’s National Crime Agency has given out an urgent national alert about a wave of spam emails due to hit the UK on Friday.