Comments on: Defeating CAPTCHAs

By: Brandon

Brandon — Tue, 14 Jan 2025 16:21:41 +0000

Removed link to the tool since this is old and well understood now. Anti-Captcha.com does this for fractions of a penny per captcha

By: CaptchaSolver

CaptchaSolver — Tue, 27 Mar 2007 07:58:45 +0000

There is already a CAPTCHA solver web service (www.captchasolver.com). It has a programming interface to call the service from any application.

By: miles

miles — Sat, 06 Jan 2007 01:42:48 +0000

1. But its cheaper than buying a domain @ $6 a pop. (Passing a captcha could get you an account on a free webhoster)
2. Check out the freelance sites. I’ve seen 50 hours of captcha answering go for $30.
3. Depends on the application that is being attacked. If they are attacking a registration form, the captcha is *very* likely to be in a consistent place, and easily parsable.

By: Brandon

Brandon — Mon, 27 Nov 2006 19:14:22 +0000

Upon analyzing this a little more, I’ve decided that spammers probably aren’t using this technique. I was able to program this in about an hour, so spammers have surely considered doing it. I see a couple reasons why not:
1- It’s not free
2- They lack the ability to hire people for a couple bucks an hour
3- It’s difficult for their scripts to identify which image should be downloaded and passed on to their human