ISO 21324-2016 PDF

Full title and description

Space data and information transfer systems — Space data link security protocol (ISO 21324:2016). This International Standard specifies a Security Protocol for CCSDS data links that provides a security header and trailer and associated procedures to apply data authentication and/or data confidentiality at the Data Link Layer, compatible with CCSDS Telemetry (TM), Telecommand (TC) and Advanced Orbiting Systems (AOS) data link protocols.

Abstract

The purpose of ISO 21324:2016 is to specify the Space Data Link Security Protocol (the Security Protocol) for CCSDS data links. The protocol defines a structured method — including a security header and a security trailer plus procedural rules — for applying data authentication and/or data confidentiality at the data link layer while remaining independent of specific cryptographic algorithms. It is intended to be used with CCSDS TM, TC and AOS space data link protocols to enable interoperable secure links for space missions.

General information

• Status: Published (confirmed at systematic review).
• Publication date: 2016-11 (published 3 November / 2016 publication process concluded November 2016).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 49.140 (Space systems and operations).
• Edition / version: Edition 1 (ISO 21324:2016).
• Number of pages: 61 (ISO edition); some national/adopted versions (for example BS ISO) include national forewords and cover pages and may list 76 pages.

Core bibliographic and lifecycle details (status, edition, publication date, technical committee and page count) are recorded on the ISO record for ISO 21324:2016; national reproductions (BS, BSI catalogues) may show different total page counts due to added national front/back matter.

Scope

ISO 21324:2016 defines the Space Data Link Security Protocol to provide authentication and/or confidentiality services at the data-link layer for CCSDS space data links. The standard establishes message formats (security header and trailer), protocol procedures, conformance and managed parameters, and an implementation conformance statement (PICS) proforma to support interoperable use across agencies and missions without mandating particular cryptographic algorithms. It is aimed at missions and systems using CCSDS TM, TC and AOS data link protocols where secure link-level protection is required.

Key topics and requirements

• Specification of a Security Protocol providing a security header and a security trailer for space data link frames.
• Procedures for applying data authentication and/or data confidentiality at the Data Link Layer (uplink and downlink).
• Compatibility requirements with CCSDS Telemetry (TM), Telecommand (TC) and Advanced Orbiting Systems (AOS) data link protocols.
• Independence from specific cryptographic algorithm choices (protocol describes how to use algorithms, not which to use).
• Conformance material including managed parameters and a Protocol Implementation Conformance Statement (PICS) proforma.
• Informative annexes covering abbreviations, references, baseline implementation modes and security/patent considerations.

Typical use and users

Typical users are space agencies, mission integrators, spacecraft and payload system architects, ground segment operators (TT&C and ground stations), security engineers, mission assurance teams and any organization involved in designing or operating CCSDS-based space links that require authentication and/or confidentiality. Use cases include protecting telemetry and telecommand links from spoofing and unauthorized access and enabling interoperable secure operations in multi-agency missions.

Related standards

ISO 21324:2016 is directly related to CCSDS Space Data Link protocols (TM, TC, AOS) and the CCSDS work on a space data link security recommendation (Space Data Link Layer Security Working Group / SLS-SEA-DLS). Implementers typically use CCSDS recommendations alongside ISO 21324 when defining link-layer security for spacecraft and ground systems. The standard was developed under the remit of ISO/TC 20/SC 13 (Space data and information transfer systems).

Keywords

space data link, security protocol, CCSDS, data link security, telemetry, telecommand, AOS, authentication, confidentiality, PICS, ISO/TC 20/SC 13.

FAQ

Q: What is this standard?

A: ISO 21324:2016 is an International Standard that specifies a Space Data Link Security Protocol for CCSDS data links to provide authentication and/or confidentiality at the data-link layer.

Q: What does it cover?

A: It covers message formats (security header and trailer), procedures for applying link-level authentication and confidentiality, conformance requirements and a PICS proforma, and guidance for interoperable implementation with CCSDS TM, TC and AOS protocols. It does not mandate specific cryptographic algorithms.

Q: Who typically uses it?

A: Space agencies, satellite manufacturers and integrators, ground segment operators, security engineers, and mission assurance teams that require standardized, interoperable link-layer security for CCSDS-based space communications.

Q: Is it current or superseded?

A: The ISO record shows ISO 21324:2016 was published in November 2016 and was last reviewed and confirmed in 2023, so the 2016 edition remains current (confirmed). National/adopted versions (for example BSI/BS ISO) may carry national forewords but do not supersede the ISO edition.

Q: Is it part of a series?

A: It sits within the general ISO/TC 20/SC 13 space data and information transfer systems work and complements CCSDS recommendations for space data link protocols. It is not a numbered multi-part ISO series itself, but it is intended to be used together with the CCSDS family of space link and related recommendations.

Q: What are the key keywords?

A: Space data link, security protocol, CCSDS, telemetry (TM), telecommand (TC), AOS, data authentication, data confidentiality, PICS, ISO/TC 20/SC 13.