ISO/IEC 9594-1:2020/Amd 1:2025
(Amendment)Information technology - Open systems interconnection - Part 1: The Directory: Overview of concepts, models and services - Amendment 1: Miscellaneous enhancements
Information technology - Open systems interconnection - Part 1: The Directory: Overview of concepts, models and services - Amendment 1: Miscellaneous enhancements
Technologies de l'information — Interconnexion de systèmes ouverts (OSI) — Partie 1: Titre manque — Amendement 1: Titre manque
General Information
- Status
- Published
- Publication Date
- 15-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
- 16-May-2025
- Due Date
- 21-Jun-2025
- Completion Date
- 16-May-2025
Relations
- Effective Date
- 23-Dec-2023
Overview
ISO/IEC 9594-1:2020/Amd 1:2025 is an amendment to the international standard covering Information Technology and Open Systems Interconnection (OSI). This document focuses on Part 1: The Directory, which provides an overview of directory concepts, models, and services. The 2025 amendment introduces miscellaneous enhancements that update key aspects of the Directory standard to reflect recent developments in public-key infrastructure (PKI), cryptographic algorithms, and secure communication protocols.
This standard is developed collaboratively by ISO, IEC, and ITU-T, and it embodies best practices for cybersecurity and directory services essential for telecommunications and information exchange between systems globally.
Key Topics
- Public-Key Infrastructure (PKI): Introduction to PKI concepts, enabling identity authentication through digital certificates and cryptographic techniques.
- Cryptographic Algorithms: Formal specifications and descriptions of encryption and digital signature algorithms that secure directory communications.
- Directory and DIB (Directory Information Base): Definitions and overviews of core directory services, data models, and how information is organized and accessed.
- Secure Protocols: Details on secure communication methods ensuring confidentiality, integrity, and authentication of directory data exchanges.
- Directory Services: Capabilities provided by the directory for querying and managing directory information with emphasis on read-heavy access patterns versus updates.
- Cybersecurity Framework: Integration of directory functions with overarching cybersecurity controls and frameworks supporting telecommunications and application layer standards.
Applications
ISO/IEC 9594-1:2020/Amd 1:2025 is critical for organizations and industries that require:
- Secure Identity Management: Implementing trusted public-key infrastructures for digital certificates, ensuring secure identity verification in distributed environments.
- Telecommunications Services: Supporting directory-based services for phone number lookup, address resolution, and subscriber information management.
- Enterprise Directories: Building directory systems that provide a hierarchical and reliable repository for user identities, privileges, and attributes.
- Network Security: Enabling secure protocol architectures that safeguard sensitive communications between directory servers and clients.
- Information Systems Interoperability: Facilitating standardized directory access and management in multinational and multi-vendor IT environments.
- Cybersecurity Compliance: Ensuring directory implementations align with global standards and best practices for encryption and identity verification.
This standard supports environments where directory data is accessed frequently but updated relatively infrequently, allowing tolerant synchronization without requiring instantaneous global update commitment.
Related Standards
- ISO/IEC 9594 series: Covers all parts related to directory services under the OSI model, including data models, protocols, and replication.
- ITU-T X.500 series: The telecommunication counterpart recommendation that defines directory services and models utilized in this international standard.
- ISO/IEC 27000 series: Provides cybersecurity frameworks which synergize with directory security for comprehensive protection.
- ISO/IEC 19790: Standard for cryptographic modules potentially referenced for securing directory functions.
- X.509: ITU-T recommendation specifying the formats for public key certificates, integral to the PKI concepts covered by this amendment.
Keywords: ISO/IEC 9594-1 Amendment 1, Directory Information Base, PKI, cryptographic algorithms, digital signature, secure protocols, cybersecurity, Open Systems Interconnection, directory services, telecommunications security, identity management.
Frequently Asked Questions
ISO/IEC 9594-1:2020/Amd 1:2025 is a standard published by the International Organization for Standardization (ISO). Its full title is "Information technology - Open systems interconnection - Part 1: The Directory: Overview of concepts, models and services - Amendment 1: Miscellaneous enhancements". This standard covers: Information technology - Open systems interconnection - Part 1: The Directory: Overview of concepts, models and services - Amendment 1: Miscellaneous enhancements
Information technology - Open systems interconnection - Part 1: The Directory: Overview of concepts, models and services - Amendment 1: Miscellaneous enhancements
ISO/IEC 9594-1:2020/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 9594-1:2020/Amd 1:2025 has the following relationships with other standards: It is inter standard links to ISO/IEC 9594-1:2020. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ISO/IEC 9594-1:2020/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 9594-1
Ninth edition
Information technology — Open
2020-11
systems interconnection —
AMENDMENT 1
Part 1:
2025-05
The Directory: Overview of
concepts, models and services
AMENDMENT 1: Miscellaneous
enhancements
Reference number
ISO/IEC 9594-1:2020/Amd. 1:2025(en) © ISO/IEC 2025
ISO/IEC 9594-1:2020/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
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or ISO’s member body in the country of the requester.
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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 9594-1:2020/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.500 (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.500 (2019) Amd. 1 (10/2024)
© ISO/IEC 2025 – All rights reserved
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ISO/IEC 9594-1:2020/Amd. 1:2025(en)
INTERNATIONAL STANDARD ISO/IEC 9594-1
RECOMMENDATION ITU-T X.500
Information technology – Open Systems Interconnection – The Directory: Overview of
concepts, models and services
Amendment 1
Miscellaneous enhancements
Summary
Amendment 1 to Recommendation ITU-T X.500 (2019) | International Standard ISO/IEC 9594-1:2020 amends the
summary and the scope of the Specification.
History
Edition Recommendation Approval Study Group Unique ID
1.0 ITU-T X.500 1988-11-25 11.1002/1000/2995
2.0 ITU-T X.500 1993-11-16 7 11.1002/1000/2996
3.0 ITU-T X.500 1997-08-09 7 11.1002/1000/4121
3.1 ITU-T X.500 (1997) Amd. 1 2000-03-31 7 11.1002/1000/5029
4.0 ITU-T X.500 2001-02-02 7 11.1002/1000/5307
5.0 ITU-T X.500 2005-08-29 17 11.1002/1000/8488
6.0 ITU-T X.500 2008-11-13 17 11.1002/1000/9587
7.0 ITU-T X.500 2012-10-14 17 11.1002/1000/11732
8.0 ITU-T X.500 2016-10-14 17 11.1002/1000/13029
9.0 ITU-T X.500 2019-10-14 17 11.1002/1000/14031
9.1 ITU-T X.500 (2019) Amd. 1 2024-10-29 17 11.1002/1000/16170
Keywords
Attribute, attribute certificates, cryptographic algorithm, digital signature, directory, directory information tree, directory
system agent, directory user agent, distinguished name, encry
...
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