Crypter un string

procedure TForm1.Button1Click(Sender: TObject);
var
s: String[255];
c: array[0..255] of Byte absolute s;
i: Integer;
begin
{encode}

s := 'SwissDelphiCenter.ch';
for i := 1 to Ord(s[0]) do c[i] := 23 xor c[i];
Label1.Caption := s;

{Decode}

s := Label1.Caption;
for i := 1 to Length(s) do s[i] := Char(23 xor Ord(c[i]));
Label2.Caption := s;
end;