  The design of wireless systems for Mission Critical Machine Type
Communication (MC-MTC) is currently a hot research topic. Wireless systems are
considered to provide numerous advantages over wired systems in industrial
applications for example. However, due to the broadcast nature of the wireless
channel, such systems are prone to a wide range of cyber attacks. These range
from passive eavesdropping attacks to active attacks like data manipulation or
masquerade attacks. Therefore it is necessary to provide reliable and efficient
security mechanisms. One of the most important security issue in such a system
is to ensure integrity as well as authenticity of exchanged messages over the
air between communicating devices in order to prohibit active attacks. In the
present work, an approach on how to achieve this goal in MC-MTC systems based
on Physical Layer Security (PHYSEC), especially a new method based on keeping
track of channel variations, will be presented and a proof-of-concept
evaluation is given.
