Re: Re: My own "captcha" from 2 years ago......
| From: | Richard Lynch | Date: | Mon, 26 Mar 2007 19:53:12 +0000 |
| Subject: | Re: Re: My own "captcha" from 2 years ago...... | ||
| Groups: | php.general | ||
| Request: | Send a blank email to php-general+get-251406@lists.php.net to get a copy of this message | ||
If the code is embedded in the audio filename, or as part of the HTML,
the CAPTCHA itself is kinda useless to a serious attack. The attacker
will simply read the code from the HTML/URL
You need the secret code to never actually leave your server for it to
stay secret.
That said, CAPTCHA can usually be broken by OCR by a serious attacker,
though that takes a little longer than simply reading the code from
HTML.
Presumably somebody somewhere could (or already has) hook up voice
recognition to an audio CAPTCHA and defeat that as well.
--
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?