public static byte[] EncryptStr2Byte(string pwd,string nodeEntropy)
{
byte[] pwdByte = Encoding.Default.GetBytes(pwd);
//pwdByte = ProtectedData.Protect(pwdByte, null, DataProtectionScope.CurrentUser);
pwdByte = ProtectedData.Protect(pwdByte, Encoding.Default.GetBytes(nodeEntropy), DataProtectionScope.CurrentUser);
return pwdByte;
}