Re: Going from simple to super CAPTCHA

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On Tue, June 12, 2007 6:25 am, tedd wrote:
> At 6:22 PM +0200 6/11/07, Tijnema wrote:
>>Server builds up a database of pictures, client does the same with
>> MD5
>>check, and problem solved...:)
>>
>>Tijnema
>
> Tijnema:
>
> Not exactly, I don't think you could MD5 this:
>
> http://sperling.com/examples/dot-captcha/
>
> To make variations of the theme. I can place any type of picture, any
> number of pictures, anywhere and ask the user to click on one (i.e.,
> click on the apple) -- there's nothing to MD5, is there?

Nothing to MD5, but the edge detection to find the blue dot would
probably be trivial.

Haven't we beat this horse to death yet?

*ANY* CAPTCHA at all is going to stop the bulk of the spam.

If your CAPTCHA is not the same (or very similar to) one that's
employed on a large-market-share system, then it's unlikely anybody
will take the effort to OCR/MD5/crack it.

If somebody has enought time to OCR/MD5/crack it, you probably aren't
going to be able to stop them, no matter what your CAPTCHA is.

-- 
Some people have a "gift" link here.
Know what I want?
I want you to buy a CD from some indie artist.
http://cdbaby.com/browse/from/lynch
Yeah, I get a buck. So?

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