Viewing profile — a3nm

I guess the problem is that it stops working when you start being big enough to attract the spammers' attention and get bots tailored to your registration system. In the meantime, …

Using OpenID makes the rest of the techniques moot (except for OpenID providers), right?

Yes, but they are only exchanging a constant amount of information to fool the server challenge, whereas we could hope to do better if the server builds challenges which use inform…