Introduction to ECSS Information Security Assurance for Space Systems

Introduction to ECSS Information Security Assurance is increasingly relevant for modern space systems, especially as security, accreditation and compliance become more important across the full lifecycle of European space projects. This article introduces the new ECSS discipline linked to information security assurance and explains how a possible security accreditation process could be structured for a European space project, system or product.

Author: Space Economy Academy.

Introduction to ECSS

ECSS-E-ST-80C is a new discipline belonging to the Space Engineering disciplines. Its purpose is to consider the wide variety of security aspects that must be examined during the lifetime of a space system, while allowing tailoring to adapt to specific missions and services.

This standard also considers the interaction between security of the system and its lifecycle, together with the corporate security of the organisations involved. It is applicable to unclassified missions and projects and can also be used or tailored, where appropriate, for classified governmental security projects, which often require additional processes and controls.

The aim of this article is to give indications and references on how to describe, based on European regulations, Commission decisions, Council decisions and related standards, a possible security accreditation process in the European Union for a space project, system or product that is currently outside the detailed scope of ECSS.

New ECSS Discipline: Information Security Assurance in the Q Branch

The discipline that aims to describe a possible security accreditation process for a space project, system or product should logically be included in the Space Product Assurance Branch, the ECSS Q branch.

This new discipline should define a set of requirements for Information Security Assurance to be implemented throughout the different phases of a space project or system lifecycle.

The reason for placing this discipline within the Q branch is that the security accreditation process is based on evidence, controls, audits, assessments and statements of compliance. These are closely aligned with the philosophy of product assurance, where decisions are based on traceability, objective evidence and verification activities.

Security Accreditation Definitions

In European regulatory practice, accreditation refers to a formal authorisation and approval granted by a Security Accreditation Authority to allow a communication and information system to operate in a specific environment and process information at a defined level of classification or sensitivity.

More specifically, accreditation can be understood as the process leading to a formal statement by the Security Accreditation Authority that a system is approved to operate with a defined level of classification, in a particular security mode, in its operational environment, and at an acceptable level of residual risk. This decision is based on the premise that an approved set of technical, physical, organisational and procedural security measures has been implemented.

This definition is especially important because it clarifies that accreditation is not just a technical review. It is a formal decision supported by evidence, governance and acceptable risk management.

Security Accreditation Authority

For each project, system or product that needs to undergo security accreditation, a Security Accreditation Authority (SAA) should be established.

The security accreditation activities of the programme components should be conducted according to applicable European security principles. In practice, the SAA is responsible for taking major security accreditation decisions and for ensuring that the system is reviewed within a structured governance framework.

Main Responsibilities of the Security Accreditation Authority

• defining and approving a security accreditation strategy,
• taking security accreditation decisions, including authorisation to operate systems and components,
• examining and approving security risk assessments,
• endorsing approved TEMPEST and cryptographic products where applicable,
• approving or participating in the approval of interconnections between accredited systems and other systems.

These tasks are central because they connect policy, operational risk, system design and programme governance.

Information Assurance Operational Authority

In addition to the SAA, an Information Assurance Operational Authority (IAOA) should also be established for each project, system or product subject to accreditation.

The IAOA plays an operational role in implementing and maintaining the security controls, processes and evidence needed to support accreditation decisions. While the SAA grants approval, the IAOA helps ensure that the operational and technical conditions for that approval are properly prepared and maintained.

Security Accreditation Strategy

The Security Accreditation Strategy (SAS) is one of the most important documents in the process. It defines the scope of the activities necessary to perform and maintain accreditation for programme components and their interconnections.

A strong SAS should clearly define:

• the scope of accreditation activities,
• the security accreditation process and required level of assurance,
• the role of relevant stakeholders,
• the accreditation schedule aligned with project phases,
• the principles for accreditation of connected networks and systems.

Roles and Responsibilities in the SAS

The Security Accreditation Strategy should identify all principal security actors involved in the process. These can include the Security Accreditation Authority, TEMPEST Authority, Crypto Approval Authority, Crypto Distribution Authority, and the Information Assurance Operational Authority.

Security Accreditation Perimeter

The SAS should identify the accreditation perimeter at a high level. This means clearly defining which parts of the project, system or product fall within the scope of accreditation, including internal and external subcomponents and their interconnections, together with their classification levels where relevant.

Site Security Accreditation

This section should describe how the SAA may authorise the site that will host the system. The objective is to verify that sensitive system equipment up to the relevant classification level can be securely deployed and operated at that site.

Typically, this requires coordination with the Local Security Authority of the country where the site is located, together with inspections, reports and security checks. The SAA can then take a decision based on these findings and any additional assessments.

System and Service Security Accreditation

The SAA may grant a time-limited authorisation to operate a system or service. This part of the process should explain how the authority verifies the implementation of security measures through audits, reviews, assessments and inspections.

All relevant evidence should be documented, because accreditation decisions need to be traceable and based on objective results.

Space Segment Security Accreditation

For space components, the SAA may also take a decision on launch approval. This should be based on evidence that security procedures have been respected throughout the launch campaign and that applicable security requirements have been correctly implemented.

Maintenance and Decommissioning

The Security Accreditation Strategy should also define how accreditation decisions are maintained over time, which events can affect them, and under which conditions they may be revoked. In addition, it should describe the security conditions for decommissioning sites and satellites.

List of Documents

The strategy should conclude with a list of required documents and evidence that the project or system owner must provide to the SAA in support of each accreditation decision.

Security Accreditation and Certification Plan

The Security Accreditation and Certification Plan (SACP) is the document that describes how the system or project owner, together with suppliers, intends to implement the Security Accreditation Strategy.

This plan should provide the roadmap, schedule and practical activities needed to reach the accreditation decisions defined in the SAS, including any intermediate approvals and the final accreditation objective.

In this sense, the SACP transforms strategy into execution. It provides the operational planning required to ensure that accreditation is not treated as a late-stage approval, but as a structured process integrated into the project lifecycle.

Why ECSS Information Security Assurance Matters

An introduction to ECSS information security assurance is important because European space systems increasingly operate in environments where cybersecurity, information protection, governance and service continuity matter as much as technical performance.

By placing information security assurance within the ECSS structure, organisations can create stronger alignment between security requirements, accreditation decisions and overall product assurance practices. This is particularly valuable for space programmes involving sensitive services, critical infrastructure and complex stakeholder environments.

In practical terms, this discipline helps space organisations move from fragmented security thinking toward a more standardised and auditable framework.

Conclusion

This introduction to ECSS information security assurance shows that security accreditation is a necessary and structured process for many space projects, systems and products. Establishing a Security Accreditation Authority, defining the accreditation perimeter, preparing a strong Security Accreditation Strategy and implementing it through a Security Accreditation and Certification Plan are all essential steps toward robust governance and secure operations.

As space systems become more connected, more strategic and more exposed to operational risks, the integration of information security assurance into ECSS becomes increasingly relevant. This discipline can provide a more coherent way to connect technical security, programme governance and accreditation decision-making across the lifecycle of a space system.