Title: How to encrypt/decrypt files with windows NTFS functions
function EncryptFile(lpFilename: PChar): BOOL; stdcall;
external advapi32 name 'EncryptFileA';
function DecryptFile(lpFilename: PChar; dwReserved: DWORD): BOOL; stdcall;
external advapi32 name 'DecryptFileA';
{....}
procedure TForm1.Button1Click(Sender: TObject);
begin
if not EncryptFile('c:\temp') then
ShowMessage('Can''t encrypt directory.');
end;
procedure TForm1.Button2Click(Sender: TObject);
begin
if not DecryptFile('c:\temp', 0) then
ShowMessage('Can''t decrypt directory.');
end;