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  • The simplest method is to create a form that has a field with a name that does not conflict with any WP reserved words

    
    <form ....>
      <input name="post_passcode"  .....>
    </form>
    

    This is just the basics, of course you should also add a nonce field as well as sanitizing the input.

    
    add_action('init', 'test_form_passcode');
    function test_form_passcode() {
      if (!isset($_POST['post_passcode'])) {
        return;
      }
      // sanitize
      // WP_Query
      // If results, loop, get post permalink
      wp_redirect($post_permalink);
    }