Hackers claim to have compromised the computer of a North Korean government hacker and leaked its contents online, offering a rare window into a hacking operation by the notoriously secretive nation.

Critical security flaws targeting Windows and Office users allow hackers to take complete control of a victim's computer by clicking a malicious link or opening a file. Patch now.

When a bad software update from the security firm CrowdStrike inadvertently caused digital chaos around the world last month, the first signs were Windows computers showing the Blue Screen of Death.