List of weakness
Friendster
Found at: http://www.friendster.com/join.php
This is a very large and famous social network. CAPTCHA is a hn free CAPCTHA with something a bit updated. Well, result is still the same. OK, they get 3 stars, but that's all.
paid4load.de
Super-easy CAPTCHA. Can be beaten easily. Weak noise, helpful color model.
MySpace.com
Found at http://signup.myspace.com/index.cfm?fuseaction=join MySpace.com is a new giant, guys. But not in CAPCTHAs. Yes, must say, it's nice, and hard to beat, but color model is not the only way to separate specific chuncks. It's possible to separate letter chuncks from background chunks basing in it's parameters, firstly - position and shape.
Jeans
Found at http://www.jeans.com.ua/sms/.
One more mobile operator - Jeans. Guys who made this CAPCTHA was inspired by Rapidshare CAPCTHA. But they don't trace it's changings - such model was hacked very quickly. Due to color model separating to chars is very easy. Then neural network makes the rest.
UMC (ver 0.2)
Found at http://www.umc.ua/ukr/sendsms.php.
New version of UMC CAPTCHA is much better then previous (see demo). Char overlapping is great. BUT - it's random there, so, sometimes there is no overlaping at all. And, of course, the char color. Thank you very much for making overlapped chars with different colors. Due to this feature overlapping means nothing, and gives no additional obfuscation. Must say that readability went down - it's now not too easy to read it correctly.
Kyivstar (ver 0.3)
Found at kyivstar.net/sms/.
The third incarnation of Kyivstar CAPTCHA is much easier then previous. In general - nothing to speak about. It's almost the same as old UMS and first KS CAPTCHAs - see OCR demo at our site.
bigmir.net version 2
After some time bigmir.net changed their CAPTCHA and now all resources of this site are accesible through signle passport account. Due to integration with ICQ there is an ability to bruteforce ICQ passwords or register ICQ accounts automately. Hard to say what hacks available, a lot of, there are chat, mail, ICQ...
- F.A.Q.
Q: What does this list include?
A: This is the list of CAPTCHAs we found, which are easy to break, and we are either already broke it or we are absolutely sure we can do this.Q: What do you mean telling "broke"?
A: This mean that we have working application which takes image and outputs the text written on it with accuracy which allows to make automation process reasonable (or we sure we can do this).Q: Can you check CAPTCHA on my site and tell me it it's secure enough?
A: Yes, we can. Contact us.