graphical letters “human user” security function as plugin?

Subj; graphical letters “human user” security function as plugin?

Hi:
On web sites, users will submit web forms to input information. Often there will be a graphic lettering code for users to read, recognize, then type in the corresponding lettes. This is to reduce likelyhood of having automated processes submit floods of transactions.

What plug-ins are available to add this functionality into wordpress audiance input?

This would be handy in conjunction with one of the Contact Us form to email plugins, and with “Register” (which is located next to “login”).

Alternatively, here is another thought on “registrations”. Could there be added a field, “What are some of the topics you would want to write about on the blog?”. A real live persion could give likely put something cohearent and understandable there, while a comments spam automated process likely could not.

Sincerely,
– – octimotor – – Tue.11/17/2009;