well, hopefully there will be brilliant minds on both sides of the fence and 'Immunocules' are developed, like Neal Stephenson describes in 'The Diamond Age':
The impregnable shield didn't work well at the nanolevel; one needed to hack the mean free path. A well-defended [en]clave was surrounded by an aerial buffer zone infested with immunocules - microscopic aerostats designed to seek and destroy invaders. ...If you stared carefully into the fog and focused on a point inches in front of your nose, you could see it sparkling, like so many microscopic searchlights, as the immunocules swept space with lidar beams. Lidar was like radar except that it used the smaller wavelengths that happened to be visible to the human eye.
