code: public void writeObject (ObjectOutputStream out)
          throws IOException
      {
          out.defaultWriteObject();
          ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
          ObjectOutputStream oOut = new ObjectOutputStream(byteOut);
          oOut.writeObject(_clearCreds);
          try {
              byte[] encrypted =
                  SecureUtil.getAESCipher(Cipher.ENCRYPT_MODE, _key).doFinal(byteOut.toByteArray());
              out.writeInt(encrypted.length);
              out.write(encrypted);
          } catch (GeneralSecurityException gse) {
              IOException ioe = new IOException("Failed to encrypt credentials");
              ioe.initCause(gse);
              throw ioe;
          }
      }
docs: A customized AES encrypting write object.