AvocadoAmber/AvocadoEdition_Light/plugin/kcaptcha/kcaptcha_session.php

<?php
include_once "_common.php";
include_once dirname(__FILE__) . "/kcaptcha_config.php";
include_once "captcha.lib.php";

while (true) {
  $keystring = '';
  for ($i = 0; $i < $length; $i++) {
    $keystring .= $allowed_symbols[mt_rand(0, strlen($allowed_symbols) - 1)];
  }
  if (!preg_match('/cp|cb|ck|c6|c9|rn|rm|mm|co|do|cl|db|qp|qb|dp|ww/', $keystring))
    break;
}

if ($keystring && function_exists('get_string_encrypt')) {
  $ip = md5(sha1($_SERVER['REMOTE_ADDR']));
  $keystring = get_string_encrypt($ip . $keystring);
}

set_session("ss_captcha_count", 0);
set_session("ss_captcha_key", $keystring);
$captcha = new KCAPTCHA();
$captcha->setKeyString(get_session("ss_captcha_key"));