On Thu, March 29, 2007 6:46 pm, TG wrote: > On Thu, March 29, 2007 3:45 pm, Tijnema ! wrote: >> You're maybe on the right path, adding images as the background >> makes >> it really hard to read the code from the image. You could for >> example >> use random images as background. > > Some of the CAPTCHA methods listed as being difficult for the PWNtcha > guys > to break involved using a variety of colorful backgrounds and other > strong > mutations. The stronger the mutation and harder for a machine to > read, > tended to also mean that humans had a harder time reading it as well. > The > idea is to break the pattern enough to make it difficult on machines, > but > easy on people. But then we fall into the same old conundrum of > better > security versus a system that's more > difficult/cumbersome/tedious/annoying > to the user. As always, we have to find a balance between "good > enough" > and "easy enough". I think we are at the point in image/voice recognition that if you're at the stage where you are fighting against somebody trying to crack the CAPTCHA at that level, the difficulty for human versus computer is such a THIN line, that you might as well just give up. Truly, it is simply NOT that difficult to write something to crack a CAPTCHA at rates close to human error margin. This has been demonstrated for MOST of the CAPTCHAs out there. -- 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
