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const

  csCryptFirst = 20;

  csCryptSecond = 230;

  csCryptHeader = 'Crypted';

type

  ECryptError = class(Exception);

function CryptString(Str:String):String;

var i,clen : Integer;

begin

  clen := Length(csCryptHeader);

  SetLength(Result, Length(Str)+clen);

  Move(csCryptHeader[1], Result[1], clen);

  For i := 1 to Length(Str) do

   begin

    if i mod 2 = 0 then

     Result[i+clen] := Chr(Ord(Str[i]) xor csCryptFirst)

    else

     Result[i+clen] := Chr(Ord(Str[i]) xor csCryptSecond);

   end;

end;

function UnCryptString(Str:String):String;

var i, clen : Integer;

begin

  clen := Length(csCryptHeader);

  SetLength(Result, Length(Str)-clen);

  if Copy(Str, 1, clen) < > csCryptHeader then

   raise ECryptError.Create('UnCryptString failed');

  For i := 1 to Length(Str)-clen do

   begin

    if (i) mod 2 = 0 then

     Result[i] := Chr(Ord(Str[i+clen]) xor csCryptFirst)

    else

     Result[i] := Chr(Ord(Str[i+clen]) xor csCryptSecond);

   end;

end;