If anything truly local and zero knowledge was allowed, there would be someone sharing their access eu-wide and everyone could install that and be done with it. One person authenticating millions.
Just due to that every system proposed has at minimum a central authority that does rate limiting.
lemmyvore@feddit.nl 3 weeks ago
Locally, how does that work?
FWIW, identity verifications schemes that attempt to maintain privacy are a contradiction in terms and cannot work. Same as encryption that both works and doesn’t work (backdoors).
Verbose version here: pluralistic.net/2025/08/14/bellovin/
Based on paper here: www.cs.columbia.edu/~smb/papers/age-verify.pdf