LDAP/X.500

RFC 1777 Lightweight Directory Access Protocol (LDAPV2)
RFC 1778 The String Representation of Standard Attribute Syntaxes
RFC 1779 A String Representation of Distinguished Names
RFC 2251 Lightweight Directory Access Protocol (LDAPV3)
RFC 2252 Attribute Syntax Definitions
RFC 2253 UTF-8 String Representation of Distinguished Names
RFC 2254 The String Representation of LDAP Search Filters
RFC 2255 The LDAP URL Format
RFC 2256 A Summary of the X.500(96) User Schema for use with LDAPv3
RFC 2829 Authentication methods for LDAP
RFC 2830 LDAP (V3): Extension for Transport Layer Security
RFC 2831 Using Digest Authentication as a SASL Mechanism
RFC 2849 The LDAP Data Interchange Format (LDIF) - Technical Specification