If you play World of Warcraft, StarCraft II, or Diablo III; you now know how PlayStaion users felt last year. Blizzard has been the latest major company hit by a hack, although unlike Sony they didn’t wait a week to tell people. Mike Morhaime made an announcement on Battle.net informing people about the hack. No billing information was compromised (unlike the Sony hack where people had to get new credit and debit cards), and the encrypted password stolen will be hard to crack:

We also know that cryptographically scrambled versions of Battle.net passwords (not actual passwords) for players on North American servers were taken. We use Secure Remote Password protocol (SRP) to protect these passwords, which is designed to make it extremely difficult to extract the actual password, and also means that each password would have to be deciphered individually.

They’re urging all Battle.net users to change their passwords, and those who use the Mobile Authenticator (and you should) will have an update to the app pushed to them soon. They’ll also be forcing a change to your secret questions on your account.