"[EMAIL PROTECTED]" wrote : Yep, the JCaptcha default engine needs a graphics 
display buffer. This is not good and won't run on servers without displays. In 
fact, I think integrating JCaptcha wasn't the best idea we ever had, it's slow, 
has unusable default output (I really can't read it), and has dependencies such 
as this.
  | 
  | Alternatives welcome...
  | 
The only other captcha engine for java I know of is "the simple java captcha" 
(http://simplecaptcha.sourceforge.net/). I have no idea if it is faster than 
JCaptcha or if it needs a running X server too but at least the output seems 
more readable (I couldn't read JCaptcha output if my life would depend on it).

However: an alternative to captchas could be asking simple math questions (like 
they do at jroller). Together with a tag that translates the numbers and the 
operand into iso & hex - e.g. 1+2 would be: 
&#x31&#59;&#x2b&#59;&#x32&#59;
 - this should be as save, cheaper to compute and much easier for users than 
barely readable captchas.

Last but not least this "translator" tag could be used to obfuscate email 
addresses so they can be safely displayed and don't get harvested by spammers 
which seems to be a quite valuable addition to me ;). Please have a look at 
http://www.seowebsitepromotion.com/obfuscate_email.asp for a more detailed 
explanation!

So what do you think about this?

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