Blizzard, as you may know, has a widget called the Authenticator. This is a hardware device that makes it very difficult to have you account hacked.
ExNovis has a write-up about it and answers the “Yes, but is it really secure?” question:
So the Blizzard Authenticator is back on sale, even after a day of being sold out. This time, itâ€™s available in more countries and it looks like Blizzard understood there would be a huge demand for them. I bought one for myself, and for my partner, Cantara. Sometimes, I get teased from people about â€˜wasting money on a device that doesnâ€™t provide total security.â€™ Well folks, Blizzard has stepped into the fray of the debate and confirmed, yes, the authenticator is secure!
Here’s the rest: For The Last Time, YES, It IS Secure