The best way to stop an epidemic might be to start one. That's the gist of a new strategy against computer viruses that was just unveiled by Israeli researchers. In their theoretical approach, when a computer network detects a new virus, it launches an internal counter-epidemic of self-propagating, protective messages. Upon receiving such a message, an uncontaminated computer immunizes itself against the virus.
If the new method proves practical, it could give rise to network-based mechanisms&mda