People here seem to think that this is someone's weekend project, not the result of serious engineering from an institute of the Fraunhofer Society (which it is).

The spec can be found at https://www.bsi.bund.de/EN/Publications/TechnicalGuidelines/... (63 pages, the BSI is the German Federal Office for Information Security, a government agency), and this is slated to become an ISO standard.

Here's the Google translation (original in German provided somewhere else by @JdeBP) of an article introducing the tech:

https://translate.google.com/translate?hl=fr&sl=auto&tl=en&u...

I agree with others that the master/slave terminology is unfortunate in new tech like this. Otherwise this looks pretty good.