Information about X.500
X.500 is a series of computer networking standards covering electronic directory services. The X.500 series was developed by ITU-T, formerly known as CCITT. The directory services were developed in order to support the requirements of X.400 electronic mail exchange and name lookup. ISO was a partner in developing the standards, incorporating them into the Open Systems Interconnection suite of protocols. ISO/IEC 9594 is the corresponding ISO identification.
X.520 and X.521 together provide a definition of a set of attributes and object classes to be used for representing people and organizations as entries in the DIT is one of the most widely deployed white pages schema.
X.509, the portion of the standard providing for an authentication framework, is now also widely used outside of the X.500 directory protocols. It specifies a standard format for public-key certificates.
X.500 protocols
The protocols defined by X.500 include:- DAP (Directory Access Protocol)
- DSP (Directory System Protocol)
- DISP (Directory Information Shadowing Protocol)
- DOP (Directory Operational Bindings Management Protocol)
X.500 data models
The primary concept of X.500 is that there is a single Directory Information Tree (DIT), a hierarchical organization of entries which is distributed across one or more servers. An entry consists of a set of attributes, each attribute with one or more values. Each entry has a unique Distinguished name, formed by combining its a Relative distinguished name (RDN), one or more attributes of the entry itself, and the RDNs of each of the superior entries up to the root of the DIT. As LDAP implements a very similar data model to that of X.500, there is further description of the data model in the article on LDAP.X.520 and X.521 together provide a definition of a set of attributes and object classes to be used for representing people and organizations as entries in the DIT is one of the most widely deployed white pages schema.
X.509, the portion of the standard providing for an authentication framework, is now also widely used outside of the X.500 directory protocols. It specifies a standard format for public-key certificates.
List of X.500 series standards
| ITU-T number | ISO/IEC number | Title of Standard |
|---|---|---|
| X.500 | ISO/IEC 9594-1 | The Directory: Overview of concepts, models and services |
| X.501 | ISO/IEC 9594-2 | The Directory: Models |
| X.509 | ISO/IEC 9594-8 | The Directory: Authentication framework |
| X.512 | ISO/IEC 9594-3 | The Directory: Abstract service definition |
| X.518 | ISO/IEC 9594-4 | The Directory: Procedures for distributed operation |
| X.519 | ISO/IEC 9594-5 | The Directory: Protocol specifications |
| X.520 | ISO/IEC 9594-6 | The Directory: Selected attribute types |
| X.521 | ISO/IEC 9594-7 | The Directory: Selected object classes |
| X.525 | ISO/IEC 9594-9 | The Directory: Replication |
| X.530 | ISO/IEC 9594-10 | The Directory: Use of systems management for administration of the Directory |
External links
- Chadwick, D W (1994, 1996). Understanding X.500 - The Directory.
- X500Standard.com The X.500 community site that is both a guide to the X.500 Standard and a repository for existing and new work being carried out on the standard.
A directory service (DS) is a software application — or a set of applications — that stores and organizes information about a computer network's users and network resources, and that allows network administrators to manage users' access to the resources.
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The ITU Telecommunication Standardization Sector (ITU-T) coordinates standards for telecommunications on behalf of the International Telecommunication Union (ITU) and is based in Geneva, Switzerland.
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X.400 is a suite of ITU-T Recommendations that define standards for Data Communication Networks for Message Handling Systems (MHS) — more commonly known as "E-mail". While X.
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The Open Systems Interconnection (usually abbreviated to OSI) was an effort to standardize networking that was started in 1982 by the International Organization for Standardization (ISO), along with the ITU-T.
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Directory Access Protocol (DAP) is a computer networking standard promulgated by ITU-T and ISO in 1988 for accessing an X.500 directory service. DAP was intended to be used by client computer systems, but was not popular as there were few implementations of the full OSI protocol
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The Open Systems Interconnection (usually abbreviated to OSI) was an effort to standardize networking that was started in 1982 by the International Organization for Standardization (ISO), along with the ITU-T.
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The Internet protocol suite is the set of communications protocols that implement the protocol stack on which the Internet and most commercial networks run. It has also been referred to as the TCP/IP protocol suite, which is named after two of the most important protocols in it:
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The Lightweight Directory Access Protocol, or LDAP (IPA: [ˈɛl dæp]), is an application protocol for querying and modifying directory services running over TCP/IP.
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A Directory Information Tree (DIT) is data represented in a hierarchical tree-like structure consisting of the Distinguished names (DNs) of the directory entries.
Both the X.
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Both the X.
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The Lightweight Directory Access Protocol, or LDAP (IPA: [ˈɛl dæp]), is an application protocol for querying and modifying directory services running over TCP/IP.
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The Lightweight Directory Access Protocol, or LDAP (IPA: [ˈɛl dæp]), is an application protocol for querying and modifying directory services running over TCP/IP.
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A white pages schema is a data model, specifically a logical schema, for organizing the data contained in entries in a directory service, database, or application, such as an address book.
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In cryptography, X.509 is an ITU-T standard for public key infrastructure (PKI). X.509 specifies, amongst other things, standard formats for public key certificates and a certification path validation algorithm.
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History and usage
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In cryptography, X.509 is an ITU-T standard for public key infrastructure (PKI). X.509 specifies, amongst other things, standard formats for public key certificates and a certification path validation algorithm.
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History and usage
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