public static function decrypt($encryptedValue)
 {
     $key = Encryption::_getKey();
     $crypt = new PHP_Crypt($key, PHP_Crypt::CIPHER_AES_128, PHP_Crypt::MODE_CBC);
     Encryption::_setIV($crypt);
     $value = $crypt->decrypt($encryptedValue);
     return $value;
 }