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Mechanisms/Architectures Bare Cryptographic Identifier (CRC, HRA, CUC, CI, PA) Identity Certificates (Above + UFN) Signature + Key Server (PC + whatever) Attribute Certificates (CRC, HRA, FPI (some), PC (w/ key server), CUC, CI, UFN, AEC, IAC, PA) Identity Provider (PC, CUC, CI, UFN, maybe PA) w/assertions (FPI, AEC, IAC) w/authentication (CRC, HRA) |