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CAPTCHA (Human Authorization)

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Author Paul
Lead Developer
#121 | Posted: 17 Jun 2014 16:11 
marsbar:
So, if I understand correctly, to have pureply numerical Captcha ouput, $t_symbols needs to be set to "2345678" (omitting 0, 1 and 9 to save confusion with letters o, O, l, and g), correct?

Yes.

marsbar:
And $symbAmount sets the length of the output.

Exactly.

Users do not related to $secretTuringPass at all. It is used in the coding process only, the image itself could be displayed only using <img> tag, images can not be embedded in HTML directly. That's why while referring to the image containing a certain code, PHP generates some encoded string for this and uses sophisticated protection password to not allow this string easily decoded with brute-force method and others.

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