RFC 2126 PDF

Internet X.509 Public Key Infrastructure Representation of Key Exchange Algorithm (KEA) Keys in Internet X.509 Public Key Infrastructure Certificates

Transparent Interconnection of Lots of Links (TRILL): Centralized Replication for Active-Active Broadcast, Unknown Unicast, and Multicast (BUM) Traffic

User Bill of Rights for entries and listings in the Public Directory

Equivalences between 1988 X.400 and RFC-822 Message Bodies