“We’re open for everyone,” announces a brightly colored sign welcoming visitors to the British Library. But inside the airy building beside London’s St Pancras Station, not everyone can get what they want. Not since the library was struck by cyber criminals at the end of last month. The ransomware attack, carried out by a group known for such activity, has knocked out the website of the UK’s national library. It has also taken down the WiFi, upon which the crowds who come here to work rely.