Sony said it discovered that between 17 and 19 April an “illegal and unauthorised person” got access to people’s names, addresses, email address, birthdates, usernames, passwords, logins, security questions and more. Children with accounts established by their parents also may have had their data exposed, according to Sony, which put the warning on its US PlayStation blog – although the warning about the compromise might not be immediately visible to passing readers. The company is also emailing people who might be affected. The intrusion is potentially one of the biggest ever into a store of credit cards. Sony’s PSN is one of the world’s biggest holders of credit cards, though not as large as Amazon, eBay, PayPal or Apple’s iTunes, which each hold more than 100m accounts. The previous largest hacking attacks were on Heartland Payment Systems in January 2009, when up to 100m US credit and debit card details were stolen, and TK Maxx in March 2007, when up to 46m credit card details were stolen.