@techreport{ietf-privacypass-protocol-04, number = {draft-ietf-privacypass-protocol-04}, type = {Internet-Draft}, institution = {Internet Engineering Task Force}, publisher = {Internet Engineering Task Force}, note = {Work in Progress}, url = {https://datatracker.ietf.org/doc/html/draft-ietf-privacypass-protocol-04}, author = {Sofia Celi and Alex Davidson and Armando Faz-Hernández and Steven Valdez and Christopher A. Wood}, title = {{Privacy Pass Issuance Protocol}}, pagetotal = 21, year = 2022, month = apr, day = 5, abstract = {This document specifies two variants of the the two-message issuance protocol for Privacy Pass tokens: one that produces tokens that are privately verifiable, and another that produces tokens that are publicly verifiable. The privately verifiable issuance protocol optionally supports public metadata during the issuance flow.}, }