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Documentation Index

Fetch the complete documentation index at: https://docs.ayliea.com/llms.txt

Use this file to discover all available pages before exploring further.

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SPD-5 — Cybersecurity Principles for Space Systems

Space Policy Directive 5 (SPD-5) is the U.S. policy directive establishing cybersecurity principles for space systems. It applies to organizations that build, operate, or support space vehicles, ground systems, and command-and-telemetry networks — defense, commercial, and civil space operators alike. SPD-5 is the right assessment when your organization owns or operates space-segment infrastructure: satellite mission operations centers, payload command and control, telemetry processing, ground stations, or supplier programs supporting those operations.
SPD-5 is a policy directive, not a regulation — but for U.S. government contractors and prime suppliers it functions as a baseline expectation. Civil and commercial operators increasingly adopt SPD-5 alignment voluntarily as a maturity signal to customers and underwriters.

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What this framework covers

The assessment is structured around the five SPD-5 principles. Each principle maps to multiple operational and engineering controls.
Development and operation of space systems using risk-based, cybersecurity-informed engineering with continuous monitoring, adaptation, and active configuration management.
Cybersecurity plans ensuring positive control of space vehicles, integrity of critical functions, and protections against unauthorized access, jamming, spoofing, ground system threats, and supply chain risks.
Adoption of established and evolving best practices and information-sharing arrangements that improve sector cybersecurity posture.
Allocation of cybersecurity responsibilities across program leadership, mission assurance, and operations — the “who owns what” question for space-segment cyber.
Coordination among federal stakeholders, reporting cadence for material cybersecurity events, and the engagement model with sector ISACs and government partners.

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Why this matters for customers

Space systems carry cybersecurity risks the IT-centric frameworks don’t address well: jamming, spoofing, telemetry integrity, command authentication, and the supply-chain exposure that comes from low-volume specialized vendors. SPD-5 codifies those concerns into a policy-aligned posture target. This assessment surfaces:
  • Whether your space-system design lifecycle bakes cybersecurity in from requirements (vs. layering it on at integration)
  • Whether positive-control mechanisms (command authentication, anti-jamming, anti-spoofing) are implemented and tested
  • Whether your ground systems and supplier relationships are governed against known threat vectors
  • Whether your reporting and information-sharing posture meets the policy-aligned baseline

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How it relates to other frameworks

SPD-5 is the policy-level directive. Pair it with these for the engineering and operations specifics:
  • NIST IR 8401 — satellite ground segment cybersecurity (the implementation companion)
  • NIST SP 800-53 — federal control catalog including SC, CM, AC, IR family controls referenced by space programs
  • NIST CSF 2.0 — the framework structure SPD-5 implementations typically use to organize their program

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Glass-Box scoring

Each question cites the SPD-5 principle and the implementing NIST IR 8401 or 800-53 control. Auditors and program managers can trace any score back to the source policy text.