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Verification image ?

 
Walter Chen
Greenhorn
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Hi, not sure it is appropriate to post on this forum (but probably more relevant here than others) -- does anyone know if there is any open source tool to generate "verification images"? By that I mean the kind of automatically generated images which contain a randomized string of alphanumeric characters so that the user has to type in the string manually, thus preventing robotic registrations, postings, etc.

Thanks in advance,
Walter
 
Ulf Dittmer
Rancher
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There are plenty such projects. The word to Google for is "captcha".
 
It is sorta covered in the JavaRanch Style Guide.
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