Blizzard has stepped up its security education program, with a big emphasis on password security. Via both a game login message and a recent blue post, Blizzard stresses the importance of having a different password for your World Of Warcraft game account and making sure that your password is a strong one.
BORNAKK: We have been helping players deal with account theft for years now, and unfortunately, roughly a third of players make a very basic security mistake: using the same password for all of their security needs.
If you are serious about protecting your account and your personal security, your Battle.net password should be different from your email account password or other personal passwords for that matter!
No one wants account thieves rooting around in their personal email, address book, and contact lists. Too often we see thieves breaking in to this information because their target has used the same password across multiple types of accounts. Not only can this give thieves access to your account, it can lead to compromises far outside of Battle.net as well.
It's immensely important that everyone use separate passwords for separate applications, including games. Secure passwords have both numeric and alphabetical values, and are usually at least 10 characters in length.
Visit my Securing WoW blog
for more details on this initiative and info on how to choose a strong password.