Facebreak, the supposed Facebook password cracker? The surveys run in a never- ending loop. The more you do, the more money the referrer makes.

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I've been doing some research on hacking recently and I found some very interesting tutorials on brute force cracking. I have some questions to ask and I'll be using Facebook as an example. Let's say that a man decides to crack the password of a single account. He downloads some Brute force program and sets it to try every single password combination with different IPs.

The same IP would be used until the captcha comes up, then it will be replaced by a new one, so facebook would not be able to stop the attack by blocking the IP. Maybe I'm just stupid (I'm not experienced in this stuff) but the only way I see that facebook can use to stop this attack is by locking the account itself (preventing anyone from logging in), but that's bad for business because it would prevent the owner itself from logging in. Does facebook actually do this for such attacks? I assume that a large website like facebook would receive these sort of attacks frequently from different crackers, and some of them may actually attack several accounts at the same time. So what does facebook do to prevent this?

Because I don't see anything it can do besides lock the account, which is not practical. It may take months or years but with this method the hacker will eventually be able to log in, would he not? Despite the fact that Facebook locks accounts after many tries as the other answers said, you should keep in mind that 'replacing your IP with a new one' is not as trivial as you make it sound.

Most internet service provider allow you to release your IP lease and get a new IP address, but the attacker will usually receive one from a small pool of a few hundred to a few thousand IP addresses. Sure, there are proxy servers and the TOR network, but these will only supply the attacker with a few hundred additional IPs. When the attacker has access to a botnet, they could use each bot of the botnet to request as many IP as they can get from their respective ISPs (good luck doing this without the user noticing anything). Usb Flash Drive Autorun Antivirus Free Download. But large botnets are expensive.

Spoofing the IP address won't work either, because IP spoofing isn't easy to do when you want to not just sent packets but also receive the responses. When you want to brute-force a HTTP login, you will need to perform a TCP handshake first, which requires to be able to receive responses. Also you certainly want to parse the response to know if you were successful. And even when you could theoretically use all ~4 Billion IPv4 addresses the internet has to offer, multiplying your tries with 4 billion only gives you enough tries to bruteforce passwords with 4-6 additional characters (depending on how many different characters the password contains).