You're trying to make it impossible to read for humans but easy to read for machines? Machiens will use your <span color:black;background:black;"></span> as an anchor in the regular expression to find the captcha in the page, and will easily spam your forms (although will require some work on the part of the spam software designer).
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 > -----Original Message----- > From: Dave Francis [mailto:[EMAIL PROTECTED] > Sent: Tuesday, August 15, 2006 9:34 AM > To: CF-Talk > Subject: captcha > > Hi, > I understand that captcha technology creates manipulated-text images > to > check that it's really a person filling in a form. I recently read > (possibly here) that it's to defeat OCR's? > > I have absolutley no idea what spammer-tech is out there, but I was > wondering why something like > <span color:black;background:black;">random-text</span> that could be > cut-and pasted into a (similarly-styled) input field wouldn't achieve the > same thing? > > As always, TIA, > > Dave > > > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| 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:249828 Subscription: http://www.houseoffusion.com/groups/CF-Talk/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=11502.10531.4
