DayZ developer Bohemia Interactive was struck by hackers today, resulting in the illegal download of player usernames, emails addresses, and passwords. Bohemia posted a letter stating that while the passwords were stolen, their encryption should protect players from the hackers using them.
Even so, Bohemia has reset all of the passwords in its database, requiring players to register for a new password in order to access the studio's website and forums.
The good news is that credit card info is safe. "We would like to reassure everyone that no other information such as credit card details is stored by us and thus was not at any risk from this illegal breach," Bohemia stated.