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Generalized Security Policy Security Policy Advertisement Mechanism Advertise any form of security policy ALWAYS comes from address X, Y or Z OPTIONAL uses STARTTLS, cert root has SHA1 P OPTIONAL uses S/MIME, cert root has SHA1 Q OPTIONAL uses PGP, validate against XKMS R NEVER uses NULL Authentication Can be generalized to other protocols IPSEC, SSH, NNTP, POP, IMAP… |