[Cryptography] Q: Relevance of physical layer security to cryptography

[mok-kong shen]

I found that there are quite some active research activities in a field
named "physical layer security", with in particular some types of codes
that apparently are different from those commonly treated in the
conventional textbooks on coding theory. Could someone kindly say the
relevance, if any, of that field to cryptography, i.e. to issues of
interest to our community (and eventually give a little bit of
introduction to that field)?

M. K. Shen