I tried different Java-related captcha solutions such as JCaptcha, SimpleCaptcha, etc. I am not satisfied. I could miss something. What I really like is something very similar to this one in terms of generated characters and look and feel.

http://drupal.org/node/468906

Does anyone know of a Java solution generating an image VERY similar to the above one?

I also tried reCaptcha and don't like it. It often generates capcha code hard for people to type it right in the first try.

有帮助吗?

解决方案

The type of Captcha you presented has already been cracked. An attacker can pre-process the image, making it thinner, then thicker (eliminating all the little dots), center each character vertically, then run it through a common OCR.

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