Do you have already buy the Blizzard Authenticator? If not come to buy as soon as possible, Blizzard Authenticator will be sold out soon. But if you have it, do you know how the Blizzard Authenticator works? why it improves security?
Quote from Wryxian, we know that The Blizzard Authenticator is a token that you can put for example on your keychain. It has a little display that, once your press the button will generate a 6-digit number that changes every minute. This number is used as a 1-time password. This means the password is only valid once. When you use it to log in, the code becomes invalid and any hacker trying to access your account later with the same number won't be able to log in.
A hacker wanting to access your account will now, in addition to keylogging your username and password, have to physically break into your house and steal the authenticator to see what number it displays. But hackers are clever people. Isn't there any way for them to know which number the authenticator is going to display? The answer is no, and here's why.
Every authenticator has a little built-in clock. This clock keeps track of the number of seconds since, for example the WoW release date, Tigole's birthday or whenever. Each authenticator also has a unique key, which it uses to encrypt this number of seconds into what looks like a completely random number. There is no way, without knowing the encryption key, to guess what number is going to be displayed at any point in time. Even if the hacker has all the numbers you entered before, he can't extrapolate that into what number will be showing next.
The hacker also can't hack into the device itself to find out it's key, because it doesn't connect to the computer in any way. Even if the hacker were the mailman who delivered the authenticator to your house, he would have to open it up and extract the hardware that contained the key. These devices are generally tamper-resistant and will purge themselves when opened.
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