unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    Edit1: TEdit;
    Edit2: TEdit;
    Edit3: TEdit;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
var
  Form1: TForm1;
const
      XorKey:array[0..7] of Byte=($A1,$B7,$AC,$57,$1C,$63,$3B,$81); //字符串加密用
implementation

{$R *.dfm}
function Enc(Str:String):String;//字符加密函數 這是用的一個異或加密
 var i,j:Integer;
begin
Result:=‘‘;
j:=0;
for i:=1 to Length(Str) do
   begin
     Result:=Result+IntToHex(Byte(Str[i]) xor XorKey[j],2);
     j:=(j+1) mod 8;
   end;
end;

function Dec(Str:String):String;//字符解密函數
var
i,j:Integer;
begin
Result:=‘‘;
j:=0;
for i:=1 to Length(Str) div 2 do
   begin
     Result:=Result+Char(StrToInt(‘$‘+Copy(Str,i*2-1,2)) xor XorKey[j]);
     j:=(j+1) mod 8;
   end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
if edit1.Text<>‘‘ then
begin
  Edit2.Text:= Enc(Edit1.text);
end;  
end;
procedure TForm1.Button2Click(Sender: TObject);
begin
 Edit3.Text:= Dec(Edit2.text);
end;
end.