Information technology - Open systems interconnection - Part 4: The Directory: Procedures for distributed operation - Amendment 1: Miscellaneous enhancements

Technologies de l'information — Interconnexion de systèmes ouverts (OSI) — Partie 4: Titre manque — Amendement 1: Titre manque

General Information

Status
Published
Publication Date
15-May-2025
ICS
35.100.70 - Application layer
Technical Committee
ISO/IEC JTC 1/SC 6 - Telecommunications and information exchange between systems
Drafting Committee
ISO/IEC JTC 1/SC 6/WG 10 - Directory, ASN.1 and Registration
Current Stage
6060 - International Standard published
Start Date
16-May-2025
Due Date
21-Jun-2025
Completion Date
16-May-2025

Relations

Amends
ISO/IEC 9594-4:2020 - Information technology - Open systems interconnection - Part 4: The Directory: Procedures for distributed operation
Effective Date
23-Dec-2023

Overview

ISO/IEC 9594-4:2020/Amd 1:2025, titled Information technology - Open Systems Interconnection - Part 4: The Directory: Procedures for distributed operation - Amendment 1: Miscellaneous enhancements, is a critical international standard published collaboratively by ISO and IEC. This amendment introduces important updates aimed at enhancing directory services within open systems interconnection frameworks, focusing particularly on improving distributed operation procedures.

The standard facilitates the separation between cybersecurity ASN.1 modules and directory ASN.1 modules, thereby supporting clearer modular development and maintenance of directory services and enhancing system security. It builds on the foundational ITU-T Recommendation X.518 (2019), maintaining compatibility while integrating miscellaneous enhancements for optimized directory operations.

Key Topics

  • Procedures for Distributed Directory Operation
    The document defines and refines the procedures involved in managing distributed directory services, crucial for maintaining interoperability in complex networked environments.

  • ASN.1 Module Separation
    The amendment modernizes the structure by separating cybersecurity-specific ASN.1 modules from directory service modules, aimed at improving clarity, scalability, and security in directory implementations.

  • Enhanced Import Sections in Annexes
    Updates to Annex A and Annex B describe the importation and exportation of types and values relevant to directory services, ensuring updated modular definitions and facilitating integration with other specifications such as ITU-T X.501, X.511, X.519, and X.520.

  • Interoperability and Security
    Emphasizes the use of strong authentication, operational bindings, and protocol specifications to guarantee secure and reliable directory interactions in open systems.

  • Collaboration Between ISO, IEC, and ITU-T
    The amendment reflects collaborative efforts between international standards organizations, ensuring that directory procedures align with global telecommunications and IT standards.

Applications

  • Distributed Directory Services
    Essential for organizations and service providers managing distributed directories in heterogeneous network environments, this standard supports directory operations used in identity management, resource discovery, and network administration.

  • Cybersecurity in Directory Implementations
    By separating security and directory modules, implementers can better address cybersecurity concerns without compromising directory functionality, enhancing the robustness of access controls and authentication mechanisms.

  • Telecommunications and IT Systems Integration
    The standard supports telecommunications operators and IT system integrators in implementing interoperable directory services that comply with internationally recognized procedures.

  • Software Development for Directory Services
    Enables developers to use well-defined ASN.1 modules for directory protocols, ensuring compatibility and ease of extending directory functionalities in complex applications.

Related Standards

  • ISO/IEC 9594 Series
    Part of the broader ISO/IEC 9594 series covering Directory services, including X.500 series standards:

    • ISO/IEC 9594-2 (X.501): Directory Information Models
    • ISO/IEC 9594-3 (X.511): Directory Abstract Service
    • ISO/IEC 9594-5 (X.519): Directory Operational Bindings
    • ISO/IEC 9594-6 (X.520): Selected Attribute Types

  • ITU-T X.518 (2019) and Amendment 1 (2024)
    The amendment corresponds with the latest ITU-T recommendations that define the directory procedures within telecommunications networks.

  • Related Security Standards
    The separation of ASN.1 modules supports integration with security standards within the ITU-T and ISO/IEC frameworks, facilitating adoption of enhanced access control and authentication protocols.

Keywords: ISO/IEC 9594-4:2020/Amd 1:2025, directory services, distributed operation, ASN.1 modules, open systems interconnection, cybersecurity, ITU-T X.518, directory procedures, distributed directories, information technology standards, telecommunications directory, security enhancements, directory operational bindings, ISO/IEC standards.

ISO/IEC 9594-4:2020/Amd 1:2025 - Information technology — Open systems interconnection — Part 4: The Directory: Procedures for distributed operation — Amendment 1: Miscellaneous enhancements Released:16. 05. 2025 - Page 1 previewISO/IEC 9594-4:2020/Amd 1:2025 - Information technology — Open systems interconnection — Part 4: The Directory: Procedures for distributed operation — Amendment 1: Miscellaneous enhancements Released:16. 05. 2025 - Page 2 previewISO/IEC 9594-4:2020/Amd 1:2025 - Information technology — Open systems interconnection — Part 4: The Directory: Procedures for distributed operation — Amendment 1: Miscellaneous enhancements Released:16. 05. 2025 - Page 3 previewISO/IEC 9594-4:2020/Amd 1:2025 - Information technology — Open systems interconnection — Part 4: The Directory: Procedures for distributed operation — Amendment 1: Miscellaneous enhancements Released:16. 05. 2025 - Page 4 preview
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ISO/IEC 9594-4:2020/Amd 1:2025 - Information technology — Open systems interconnection — Part 4: The Directory: Procedures for distributed operation — Amendment 1: Miscellaneous enhancements Released:16. 05. 2025

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Frequently Asked Questions

ISO/IEC 9594-4:2020/Amd 1:2025 is a standard published by the International Organization for Standardization (ISO). Its full title is "Information technology - Open systems interconnection - Part 4: The Directory: Procedures for distributed operation - Amendment 1: Miscellaneous enhancements". This standard covers: Information technology - Open systems interconnection - Part 4: The Directory: Procedures for distributed operation - Amendment 1: Miscellaneous enhancements

Information technology - Open systems interconnection - Part 4: The Directory: Procedures for distributed operation - Amendment 1: Miscellaneous enhancements

ISO/IEC 9594-4:2020/Amd 1:2025 is classified under the following ICS (International Classification for Standards) categories: 35.100.70 - Application layer. The ICS classification helps identify the subject area and facilitates finding related standards.

ISO/IEC 9594-4:2020/Amd 1:2025 has the following relationships with other standards: It is inter standard links to ISO/IEC 9594-4:2020. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

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Standards Content (Sample)


International
Standard
ISO/IEC 9594-4
Ninth edition
Information technology — Open
2020-11
systems interconnection —
AMENDMENT 1
Part 4:
2025-05
The Directory: Procedures for
distributed operation
AMENDMENT 1: Miscellaneous
enhancements
Reference number
ISO/IEC 9594-4:2020/Amd. 1:2025(en) © ISO/IEC 2025

ISO/IEC 9594-4:2020/Amd. 1:2025(en)
© ISO/IEC 2025
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
© ISO/IEC 2025 – All rights reserved
ii
ISO/IEC 9594-4:2020/Amd. 1:2025(en)
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are
members of ISO or IEC participate in the development of International Standards through technical
committees established by the respective organization to deal with particular fields of technical activity.
ISO and IEC technical committees collaborate in fields of mutual interest. Other international
organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the
work.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of document should be noted.
ISO and IEC draw attention to the possibility that the implementation of this document may involve the
use of (a) patent(s). ISO and IEC take no position concerning the evidence, validity or applicability of any
claimed patent rights in respect thereof. As of the date of publication of this document, ISO and IEC had
not received notice of (a) patent(s) which may be required to implement this document. However,
implementers are cautioned that this may not represent the latest information, which may be obtained
from the patent database available at www.iso.org/patents and https://patents.iec.ch. ISO and IEC shall
not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT)
see www.iso.org/iso/foreword.html. In the IEC, see www.iec.ch/understanding-standards.
This document was prepared by ITU-T as ITU-T X.518 (2019) Amd. 1 (10/2024) and drafted in
accordance with its editorial rules, in collaboration with Joint Technical Committee ISO/IEC
JTC 1, Information technology, Subcommittee SC 6, Telecommunications and information
exchange between systems.
A list of all parts in the ISO/IEC 9594 series can be found on the ISO and IEC websites.
Any feedback or questions on this document should be directed to the user’s national standards body.
A complete listing of these bodies can be found at www.iso.org/members.html and
www.iec.ch/national-committees.
Rec. ITU-T X.518 (2019) Amd. 1 (10/2024)
© ISO/IEC 2025 – All rights reserved
iii
ISO/IEC 9594-4:2020/Amd. 1:2025(en)
INTERNATIONAL STANDARD ISO/IEC 9594-4
RECOMMENDATION ITU-T X.518
Information technology – Open Systems Interconnection – The Directory:
Procedures for distributed operation

Amendment 1
Miscellaneous enhancements
Summary
Amendment 1 to Recommendation ITU-T X.518 (2019) | International Standard ISO/IEC 9594-4:2020 introduces text
updates to facilitate separation between cybersecurity ASN.1 modules and directory ASN.1 modules

History
Edition Recommendation Approval Study Group Unique ID
1.0 ITU-T X.518 1988-11-25 11.1002/1000/3005
2.0 ITU-T X.518 1993-11-16 7 11.1002/1000/3006
3.0 ITU-T X.518 1997-08-09 7 11.1002/1000/4125
3.1   ITU-T X.518 (1997) Technical Cor. 1 2000-03-31 7 11.1002/1000/5038
3.2   ITU-T X.518 (1997) Amd. 1 2000-03-31 7 11.1002/1000/5037
3.3   ITU-T X.518 (1997) Technical Cor. 2 2001-02-02 7 11.1002/1000/5316
4.0 ITU-T X.518 2001-02-02 7 11.1002/1000/5318
4.1   ITU-T X.518 (2001) Technical Cor. 1 2005-05-14 17 11.1002/1000/8505
4.2   ITU-T X.518 (2001) Cor. 2 2008-05-29 17 11.1002/1000/9435
5.0 ITU-T X.518 2005-08-29 17 11.1002/1000/8506
5.1   ITU-T X.518 (2005) Cor. 1 2008-05-29 17 11.1002/1000/9436
5.2   ITU-T X.518 (2005) Cor. 2 2011-02-13 17 11.1002/1000/11046
6.0 ITU-T X.518 2008-11-13 17 11.1002/1000/9596
6.1   ITU-T X.518 (2008) Cor. 1 2011-02-13 17 11.1002/1000/11047
6.2   ITU-T X.518 (2008) Cor. 2 2012-10-14 17 11.1002/1000/11739
7.0 ITU-T X.518 2012-10-14 17 11.1002/1000/11740
8.0 ITU-T X.518 2016-10-14 17 11.1002/1000/13034
9.0 ITU-T X.518 2019-10-14 17 11.1002/1000/14035
9.1   ITU-T X.518 (2019) Amd. 1 2024-10-29 17 11.1002/1000/16174

To access the Recommendation, type the URL https://handle.itu.int/ in the address field of your web browser, followed by the
Recommendation's unique ID.
Rec. ITU-T X.518 (2019) Amd. 1 (10/2024)
© ISO/IEC 2025 – All rights reserved
iv
ISO/IEC 9594-4:2020/Amd. 1:2025(en)
FOREWORD
The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of
telecommunications, and information and communication technologies (ICTs). The ITU Telecommunication
Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical,
operating and tariff questions and issuing Recommendations on them with a view to standardizing
telecommunications on a worldwide basis.
The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes
the topics for study by the ITU-T study groups which, in turn, produce Recommendations on th
...

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