Since the captcha can only be read using graphical browsers, I thought of this idea to enable users with textish browsers to read the captcha code too.
It's not secure though. Since the captcha code gets printed in a HTML tag (that's how textish browsers can read it), a script can read the code and bypass your captcha protection. I don't recommend applying the patch if you are going to use captcha in anything other than fighting spam comments :).
captcha.module.patch
--- captcha.module.orig 2005-01-19 17:00:08.000000000 +0200 +++ captcha.module 2005-03-05 00:12:03.921875000 +0200 @@ -83,9 +83,10 @@ if (_captcha_istrue("captcha_user_register") && !$newuser->uid && !$user->uid) switch ($type) { case t("register"): - // Add two items to the resigtration form. + $string = _captcha_code(); + // Add two items to the resigtration form. $output .= form_textfield(t('Word'), 'captchaword', NULL, 15, 15, 'Please type in the letters/numbers that are shown in the image above.', NULL, TRUE); return array(array('title' => t('Verify Registration'), 'data'=>$output)); @@ -137,7 +138,8 @@ case 'form': if (sess_read('captcha_comment_correct')!='ok') { + $string = _captcha_code(); $output .= form_textfield(t('Word'), 'captchaword', NULL, 15, 15, 'Please type in the letters/numbers that are shown in the image above.', NULL, TRUE); return form_group(t('Verify comment authorship'), $output); } else return NULL; @@ -206,7 +208,7 @@ header('Content-type: image/png'); - $string = _captcha_code(); + $string = sess_read('captcha'); //set up image, the first number is the width and the second is the height $im = imagecreatetruecolor(120, 20);
