Staysure, a British company that provides travel insurance, has suffered a data breach. The company said that hackers broke into its servers in the second half of October 2013, but the breach was detected only in mid-November. In a notice posted on its website, Staysure reveals that the attackers stole names, addresses, encrypted payment card details, and CVVs. The information belongs to customers who had purchased insurance before May 2012. After this date, Staysure…