Check out Gimpy, which I believe is what Yahoo uses: http://www.captcha.net/captchas/gimpy/ http://www.captcha.net/
Narins, Josh wrote:
Can GIMP be programmatically set up to warp/woof/weird-out an image?
Yahoo's warped words works, I bet, since they use it.
I'm referring to get getting an anon email account from yahoo.com
-----Original Message-----
From: Bill Moseley [mailto:[EMAIL PROTECTED]] Sent: Wednesday, December 18, 2002 1:13 PM
To: [EMAIL PROTECTED]
Subject: [OT] Ideas for limiting form submissions
I've got a mod_perl feed-back form that sends mail to a specific address..
Spammers have their bots hitting the form now. The tricks I know of are:
- generate a random image of numbers and make the user type in the numbers
on the form. Painful for the user and spammers probably have OCR!
- require an email and send a confirmation email (like a list
subscription) and whitelist some email addresses. But we want to allow
anonymous submissions.
- limit submissions by IP number to one every X minutes. AOL users may get
blocked.
- md5 the submission and block duplicates (should do this anyway). BTW --
what would you recommend for caching the md5 strings. Cache::Cache or DBM?
I suppose a Cache::Cache file cache would be the easiest.
Any other ideas on the "easy to implement" side?
