On Tue, June 12, 2007 7:01 am, tedd wrote: > I was thinking about this the other day -- computers are fast and > people are generally slow. So, instead of making the time short, > examine how fast the answer was obtained. Immediate = computer; > delayed = human. > > Even an easy LETTER CAPTCHA takes time for a human, but a computer > can recognize and respond much quicker. > > I know, spammy can delay his bot's response, but it's just a > difference between computer/human to consider.
Some sites already employ this kind of thing to stop badly-written robots from pounding their server. OTOH, wget has a random delay built-in to defeat this kind of thing. So somebody somewhere will figure out that's what the trick is, and write code to bypass it. So, as before, *ANY* captcha you use will stop the bulk of spam. *ANY* captcha you use is crackable by somebody somewhere. -- Some people have a "gift" link here. Know what I want? I want you to buy a CD from some indie artist. http://cdbaby.com/browse/from/lynch Yeah, I get a buck. So? -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
