X.500 Standard status
(Implementors' Guide)

X.509 Related activities

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X.500 General

Tutorial section 2
X.509 specific

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X.500 Relationship with LDAP

Relationship with LDAP
Figure 1 - Relationship with LDAP

The Lightweight Directory Access Protocol (LDAP) was originally developed for simple access to an X.500 directory. LDAP has later developed into an actual server specification based on the X.500 model.

As the intention was to create a simpler specification than X.500, the functionality of LDAP is correspondingly reduced to what was considered most usable. However, there are features in LDAP that is not part of X.500.

There are many similarities between LDAP and DAP, but the syntax is different. DAP make full use of Abstract Syntax Notation One (ASN.1), while uses are more simple ASN.1 approach combined textual formats. DAP has also more security functions than LDAP.

Most, if not all, DSA implementations support LDAP access.

LDAP servers widely implemented and used.

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