I checked a related question, but I still did not find the answer I was looking for.
Specifically, do we have any statistics on the usage of DES/2DES/3DES? It seems from here that credit card systems are relying on 3DES. Is this still the case?
Also, I guess that many old satellites are still relying on some DES for their operations. Is it true?
In general, is there any overview on how many physical systems still rely on the DES symmetric cryptographic scheme?
EDIT: funnily enough, I posted the question on the 39th49th DES anniversary. Happy birthday, DES!