Authn > digital signatures. Authz > nothing in real systems. There’s research in attribute based encryption (ABE) that leads to attribute based access control,

Authn > digital signatures. Authz > nothing in real systems. There’s research in attribute based encryption (ABE) that leads to attribute based access control, but I’ve never seen any actual system using cryptography for authz. On the topic of digital signatures there’s many new stuff including but not limited to threshold signatures (eg FROST), aggregate signatures (eg BLS as used in ETH consensus), batch signatures (typically verification).