Please take a look at the FAQ (http://us.battle.net/support/en/article/important-security-update-faq) for details on what you should do, and for more information about the compromise. A basic checklist may be as follows:Players and Friends,Even when you are in the business of fun, not every week ends up being fun. This week, our security team found an unauthorized and illegal access into our internal network here at Blizzard. We quickly took steps to close off this access and began working with law enforcement and security experts to investigate what happened.At this time, we’ve found no evidence that financial information such as credit cards, billing addresses, or real names were compromised. Our investigation is ongoing, but so far nothing suggests that these pieces of information have been accessed.Some data was illegally accessed, including a list of email addresses for global Battle.net users, outside of China. For players on North American servers (which generally includes players from North America, Latin America, Australia, New Zealand, and Southeast Asia) the answer to the personal security question, and information relating to Mobile and Dial-In Authenticators were also accessed. Based on what we currently know, this information alone is NOT enough for anyone to gain access to Battle.net accounts.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. As a precaution, however, we recommend that players on North American servers change their password. Please click this link to change your password. Moreover, if you have used the same or similar passwords for other purposes, you may want to consider changing those passwords as well.In the coming days, we'll be prompting players on North American servers to change their secret questions and answers through an automated process. Additionally, we'll prompt mobile authenticator users to update their authenticator software. As a reminder, phishing emails will ask you for password or login information. Blizzard Entertainment emails will never ask for your password. We deeply regret the inconvenience to all of you and understand you may have questions. Please find additional information here.We take the security of your personal information very seriously, and we are truly sorry that this has happened.Sincerely,Mike Morhaime
- Change your Battle.net account password immediately. Be sure to use a strong password. See * below for tips on how to choose a strong password.
- Change the password of the e-mail account associated with your Battle.net account immediately if it was the same as your Battle.net account password. Do not use the same password for both your Battle.net account and your e-mail address.
- Make sure that any Secret Question & Answer system for recovering access to your e-mail account(s) and other gaming accounts is not the same as your Secret Question & Answer for your Battle.net account.
*: If you're having trouble picking a strong password, try this advice from the Naked Security Blog (completely SFW) from the antivirus and computer security firm Sophos: