>The whole point of images is that humans can easily read them (more or less) >and computers have a tough time. So even if somebody really wanted to write >a program to automatically post to your forms, it would be very difficult if >not impossible for them to do so, unless they had humans do the input (This >of course depends on the quality of the captcha software that you're using. >Some software is fairly easy to defeat using OCR, but everything in security >is relative.). The lyla captcha is pretty good, and I doubt it would be >easy, if not impossible to defeat it using OCR.
Russ is right. The whole point of a Turing test is to tell a human and a computer apart. The more accurate you want this test to be, the harder it is on the human to solve. There is a point of diminishing returns on test difficulty. Well, designed Captchas aim to be human solvable about 80-90% of the time. Thus why sometimes you get a Captcha that "requires" you to guess the letter or number. Some people whine that "l", "L", "I" and "1" are hard to distinguish. That is true, but humans are better at guessing than computer which can be an important element of Captcha design. Some "new-age" Captcha use pictures of objects (i.e. common things, animals, etc.) and thus the person to type in the name of the object. While this is a nifty idea, it requires the person to have general knowledge about the picture. My spelling isn't the best, can you spell aardvark? This also limits the Captcha to one language which is something that Americans usually don't think about. Best, Peter J. Farrell LylaCaptcha http://lyla.maestropublishing.com ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Introducing the Fusion Authority Quarterly Update. 80 pages of hard-hitting, up-to-date ColdFusion information by your peers, delivered to your door four times a year. http://www.fusionauthority.com/quarterly Archive: http://www.houseoffusion.com/groups/CF-Talk/message.cfm/messageid:249861 Subscription: http://www.houseoffusion.com/groups/CF-Talk/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=11502.10531.4
