Tuesday, November 20, 2007
Testing a reverse captcha
Back when you could sign up to get email notifications of updates around here, I noticed some spammers were attempting to abuse the script, and after playing around with it, I decided to scrap that feature, but later mused on using a reverse captcha to keep spammers at bay.
But while I dont' have comments, I do invite comments on another website I control. And that form is now getting spammed (and like my former Obligatory Email Notification, the only one who sees anything is me).
And when they're not hawking 3″ mortgage extensions, I get incomprehensible stuff like:
- <a href="http://salihome.info/show/index.html">Three hip-hop artists have key parts in American Gangster.</a><br> <a href="http://oscines.cn/myspace-layout/index.html">Andre 3000 takes a turn with Charlize Theron in Battle in Seattle.</a><br> <a href="http://myspace-layout.tripod.com/">Robert De Niro and Al Pacino reunite next year in the crime drama…</a><br> <a href="http://rigolu.cn/sex-portal/main.html">MORE big screen… </a>
So I decided to put my “reverse captcha” theory to the test. I added
<TEXTAREA> to the form, and if it's
changed in any way, I ignore the submission. I'm curious to see how long it
takes the spammers to adapt, if any bother.