http://us.battle.net/d3/en/forum/top...673?page=9#176
We've stated this several times, but in all of the individual Diablo III-related compromise cases we've investigated thus far, none have occurred after a physical Battle.net Authenticator or Battle.net Mobile Authenticator app was attached to the player's account.
While no security method is 100% fool-proof (even Authenticators), please note that it is possible that players reporting to have been compromised while an Authenticator was attached to their Battle.net account may have been using the Dial-in Authenticator. The Dial-in Authenticator does not provide the same level of protection as the Battle.net Authenticator or Battle.net Mobile Authenticator app, and -- more importantly -- is not currently supported for Diablo III.
It's important to remember there is no "silver bullet" guaranteeing complete protection against account compromise. The Authenticator offers players a highly valuable layer of added protection, but is not intended to replace the need for end-user computer and network security.
didn't someones here say there account was hacked with a authenticator attached to it? you should post in that thread an tell the blue he full of shit