Cybersecurity experts say the highly sensitive data of 12.9 million Australians, stolen from e-scripts provider MediSecure, has been listed as 'sold' on the dark web and is up for sale again at a bargain price. The ransomware attack took place last year, and just last week, the now-defunct company revealed the scale of the breach. Online security specialist Jamie O'Reilly says it's a worrying development.