* @return 
      */  
    private byte [] decryptByte( byte [] byteD) {  
       Cipher cipher;  
       byte [] byteFina = null ;  
       try {  
           cipher = Cipher.getInstance ( "DES" );  
           cipher.init(Cipher. DECRYPT_MODE , key );  
           byteFina = cipher.doFinal(byteD);  
       } catch (Exception e) {  
           throw new RuntimeException(  
                  "Error initializing SqlMap class. Cause: " + e);  
       } finally {  
           cipher = null ;  
       }  
       return byteFina;  
    }