private static string GetPwd(string pwd)
        {
            var sRet = string.Empty;

            for (int i = 0; i < pwd.Length; i++)
            {
                sRet = sRet + (char)(pwd[pwd.Length - 1 - i] ^ pwd.Length);
            }

            return sRet;
        }

 string secretPWD = "{ez+{an{";
 string pwd = GetPwd(secretPWD);