  Space systems enable essential communications, navigation, imaging and
sensing for a variety of domains, including agriculture, commerce,
transportation, and emergency operations by first responders. Protecting the
cybersecurity of these critical infrastructure systems is essential. While the
space environment brings unique constraints to managing cybersecurity risks,
lessons learned about risks and effective defenses in other critical
infrastructure domains can help us to design effective defenses for space
systems. In particular, discoveries regarding cybersecurity for industrial
control systems (ICS) for energy, manufacturing, transportation, and the
consumer and industrial Internet of Things (IoT) offer insights into
cybersecurity for the space domain. This paper provides an overview of ICS and
space system commonalities, lessons learned about cybersecurity for ICS that
can be applied to space systems, and recommendations for future research and
development to secure increasingly critical space systems.
