ISO/IEC 9594-9:2020/Amd 1:2025
(Amendment)Information technology - Open systems interconnection - Part 9: The Directory: Replication - Amendment 1: Miscellaneous enhancements
Information technology - Open systems interconnection - Part 9: The Directory: Replication - Amendment 1: Miscellaneous enhancements
Technologies de l'information — Interconnexion de systèmes ouverts (OSI) — Partie 9: Titre manque — Amendement 1: Titre manque
General Information
- Status
- Published
- Publication Date
- 18-May-2025
- Drafting Committee
- ISO/IEC JTC 1/SC 6/WG 10 - Directory, ASN.1 and Registration
- Current Stage
- 6060 - International Standard published
- Start Date
- 19-May-2025
- Due Date
- 22-Jun-2025
- Completion Date
- 19-May-2025
Relations
- Effective Date
- 23-Dec-2023
Overview
ISO/IEC 9594-9:2020/Amd 1:2025 is the latest amendment to the international standard for Information Technology - Open Systems Interconnection (OSI) - focusing on The Directory: Replication. This amendment, published in 2025, introduces miscellaneous enhancements primarily aimed at improving the replication mechanisms within directory services. It supports the evolving needs for enhanced cybersecurity and better modularization of ASN.1 (Abstract Syntax Notation One) standards, ensuring greater clarity and interoperability in directory replication processes.
Developed in collaboration between ISO, IEC, and ITU-T, this standard plays a key role in global telecommunications and IT infrastructure by defining protocols for directory replication. The update also ensures separation between cybersecurity ASN.1 modules and directory ASN.1 modules for better security and system management.
Key Topics
Directory Replication Enhancements
The amendment refines replication mechanisms for directory services, enabling improved synchronization across distributed directories and reducing inconsistencies.ASN.1 Modularization
Facilitates the separation of cybersecurity ASN.1 modules from directory ASN.1 modules. This modular approach simplifies maintenance, upgrades, and enhances system security.Interoperability Improvements
Ensures compatibility across different implementations by updating imports and definitions in Annex A. This supports seamless communication between directory services in heterogeneous environments.Updates to Directory Shadow Abstract Service
Incorporates enhanced service definitions to better support directory shadowing via distributed operations and operational bindings.Enhanced Security Integration
Aligns directory replication protocols with enhanced security frameworks, incorporating OPTIONAL protective mechanisms for secure data exchanges.
Applications
Telecommunications Directory Services
Implements robust directory replication in telecom networks, supporting subscriber and network resource data consistency across distributed systems.Enterprise IT Infrastructures
Enables synchronization of directory data such as user identities, access rights, and organizational information across multiple servers and sites.Cybersecurity Systems
Improves secure replication of authorization and authentication data by isolating security-related ASN.1 definitions, reducing risk of security breaches.Cloud and Distributed Computing
Supports large-scale distributed directories critical in cloud services and federated identity management, ensuring data consistency and operational reliability.Standards-Based Directory Solutions
Applies in LDAP and X.500-based directory implementations requiring standardized replication for vendor-neutral interoperability.
Related Standards
ISO/IEC 9594 Series
The Directory series includes parts on naming, functional models, abstract service definitions, and protocols. Part 9 specifically addresses replication protocols and related operations.ITU-T Recommendations X.501, X.518, X.525
Closely related telecommunications standards defining directory services architecture, directory access protocols, and replication operations.ISO/IEC 9594-2 (Information Framework)
Provides foundational schema and directory information models that complement replication mechanisms defined in Part 9.Directory Operational Binding and Enhanced Security Modules
Refer to operational bindings (ITU-T X.518) and enhanced security frameworks to understand security protections integrated into directory replication.
By adopting ISO/IEC 9594-9:2020/Amd 1:2025, organizations benefit from enhanced directory replication robustness, improved security modularity, and better interoperability between distributed information systems. This amendment supports modern IT and telecommunication infrastructures demanding scalable, secure, and standardized directory services replication.
Frequently Asked Questions
ISO/IEC 9594-9:2020/Amd 1:2025 is a standard published by the International Organization for Standardization (ISO). Its full title is "Information technology - Open systems interconnection - Part 9: The Directory: Replication - Amendment 1: Miscellaneous enhancements". This standard covers: Information technology - Open systems interconnection - Part 9: The Directory: Replication - Amendment 1: Miscellaneous enhancements
Information technology - Open systems interconnection - Part 9: The Directory: Replication - Amendment 1: Miscellaneous enhancements
ISO/IEC 9594-9:2020/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 9594-9:2020/Amd 1:2025 has the following relationships with other standards: It is inter standard links to ISO/IEC 9594-9:2020. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ISO/IEC 9594-9:2020/Amd 1:2025 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
International
Standard
ISO/IEC 9594-9
Eighth edition
Information technology — Open
2020-11
systems interconnection —
AMENDMENT 1
Part 9:
2025-05
The Directory: Replication
AMENDMENT 1: Miscellaneous
enhancements
Reference number
ISO/IEC 9594-9:2020/Amd. 1:2025(en) © ISO/IEC 2025
ISO/IEC 9594-9:2020/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
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© ISO/IEC 2025 – All rights reserved
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ISO/IEC 9594-9:2020/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
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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.525 (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.525 (2019) Amd. 1 (10/2024)
© ISO/IEC 2025 – All rights reserved
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ISO/IEC 9594-9:2020/Amd. 1:2025(en)
INTERNATIONAL STANDARD ISO/IEC 9594-9
RECOMMENDATION ITU-T X.525
Information technology – Open Systems Interconnection – The Directory: Replication
Amendment 1
Miscellaneous enhancements
Summary
Amendment 1 to Recommendation ITU-T X.525 (2019) | International Standard ISO/IEC 9594-9:2020 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.525 1993-11-16 7 11.1002/1000/3014
2.0 ITU-T X.525 1997-08-09 7 11.1002/1000/4129
2.1 ITU-T X.525 (1997) Technical Cor. 1 2000-03-31 7 11.1002/1000/5045
2.2 ITU-T X.525 (1997) Amd. 1 2000-03-31 7 11.1002/1000/5044
2.3 ITU-T X.525 (1997) Technical Cor. 2 2001-02-02 7 11.1002/1000/5327
3.0 ITU-T X.525 2001-02-02 7 11.1002/1000/5328
4.0 ITU-T X.525 2005-08-29 17 11.1002/1000/8510
4.1 ITU-T X.525 (2005) Cor. 1 2011-02-13 17 11.1002/1000/11052
5.0 ITU-T X.525 2008-11-13 17 11.1002/1000/9600
5.1 ITU-T X.525 (2008) Cor. 1 2011-02-13 17 11.1002/1000/11053
6.0 ITU-T X.525 2012-10-14 17 11.1002/1000/11745
7.0 ITU-T X.525 2016-10-14 17 11.1002/1000/13038
8.0 ITU-T X.525 2019-10-14 17 11.1002/1000/14047
8.1 ITU-T X.525 (2019) Amd. 1 2024-10-29 17 11.1002/1000/16178
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.525 (2019) Amd. 1 (10/2024)
© ISO/IEC 2025 – All rights reserved
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ISO/IEC 9594-9:2020/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
Standar
...
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