Premera Blue Cross , a major provider of health care services, disclosed today that an intrusion into its network may have resulted in the breach of financial and medical records of 11 million customers. Although Premera isn’t saying so just yet, there are independent indicators that this intrusion is once again the work of state-sponsored espionage groups based in China. In a statement posted on a Web site set up to share information about the breach — premeraupdate.com — the company said that it learned about the attack on January 29, 2015
