protected function createSecurityBuffer($value, $offset, $is16 = false)
    {
        $length = strlen(bin2hex($value));
        $length = $is16 ? $length / 2 : $length;
        $length = $this->createByte(str_pad(dechex($length), 2, '0', STR_PAD_LEFT), 2);

        return $length.$length.$this->createByte(dechex($offset), 4);
    }