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@LeaKissner @shawnwillden @bennetyee I know you are interested in crypto protocols, so here goes: michaelhoelzl.eu/files/pdfs/Hoelzl2018Revocation.pdf. Privacy-preserving revocation is one of the surprisingly interesting design spaces. (Caveat: it is still undecided what the next iteration of ISO 18013-5 will do for revocation in the future.)