  Critical infrastructure constitutes the foundation of every society. While
traditionally solely relying on dedicated cable-based communication, this
infrastructure rapidly transforms to highly digitized and interconnected
systems which increasingly rely on wireless communication. Besides providing
tremendous benefits, especially affording the easy, cheap, and flexible
interconnection of a large number of assets spread over larger geographic
areas, wireless communication in critical infrastructure also raises unique
security challenges. Most importantly, the shift from dedicated private wired
networks to heterogeneous wireless communication over public and shared
networks requires significantly more involved security measures. In this paper,
we identify the most relevant challenges resulting from the use of wireless
communication in critical infrastructure and use those to identify a
comprehensive set of promising opportunities to preserve the high security
standards of critical infrastructure even when switching from wired to wireless
communication.
