Parts of the X.500 Standard

• X.500 - Overview of concepts, models and services

• X.501 - Models

• X.509 - Authentication framework

• X.511 - Abstract service definition

• X.518 - Procedures for distributed operation

• X.519 - Protocol specifications

• X.520 - Selected attribute types

• X.521 - Selected object classes

• X.525 - Replication (since 1993 version)

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