title: CakePHP SecurityComponent is blackholing my ReCAPTCHA
body: <p>I'm using <a href="https://github.com/Jahdrien/ReCaptcha-Plugin" rel="nofollow">Jahdrien's ReCAPTCHA plugin</a> in my CakePHP 2.4 app, which installs just fine. The problem is that I'm using SecurityComponent to protect against forged forms, which is also protecting me against the ReCAPTCHA plugin.</p>
  
  <p>I've got the plugin set up on my Users controller and enabled on my <code>register</code> action, but when I try to register a user I get an error: <em>The request has been black-holed.</em> Cake has detected the extra field from the CAPTCHA and suspects foul play.</p>
  
  <p>The question is: How do I whitelist the CAPTCHA without opening my entire form to attacks? I inspected the element and saw that the input's name is <code>recaptcha_response_field</code>, so I tried unlocking it by name right before the CAPTCHA, to no effect.</p>
  
  <pre><code>$this-&gt;Form-&gt;unlockField('recaptcha_response_field');
  echo $this-&gt;Recaptcha-&gt;show(array(
      'theme' =&gt; 'white',
      'lang' =&gt; 'en',
  ));
  </code></pre>