In this lecture, the fundamentals and paradigms of information-theoretical security (ITS) are conveyed, i.e. security mechanisms that cannot be traced back to "solving a difficult problem". ITS should come into play in future communication systems (e.g. evolutionary path from 5G to 6G or WiFi-6) and addresses essential aspects of new services such as the IoT, the tactile Internet, etc., especially with regard to scalable, fast and also user-manageable security ("Usability "). Another aspect that is frequently mentioned is security for the post-quantum age. Generally speaking, ITS uses the properties of the transmission channel in a targeted manner, e.g. through tap-proof coding or by generating a shared secret ("common information") about the specific properties of the complex electromagnetic wave propagation in the transmission medium.

Matthieu Bloch and Joao Barros: Physical Layer Security: From Information Theory to Security Engineering. Cambridge University Press, 2011