>>22Yeah, but without false positives. You can automate the work with victims, which is why you need the multiple choices.
>>17Well, I am just solving subscriptions, not regular "human" verification for simple things like file repos (rapidshares). For those, you can just use simple text captcha's and your done. And it only uses the protocol you are using. So if the verification is for HTTP servers, it stays in HTTP. A tad of human annoyance is worth the cost bots abusing the subscription system.
And again, I am pro bots in most ways. I was just looking to solve the phishing dilemma, and I think I found it.