What attestation do defense robotic systems require?
Defense robotic systems require attestation that answers three questions on demand: is this the genuine unit, is it running an authorized and untampered build, and was every consequential action it took actually authorized? A program cannot treat a fielded robot as trusted simply because it is on the network. It has to be able to prove identity, software state, and action authority with evidence a third party can check.
RankShield structures that evidence around the IETF RATS model, which cleanly separates the attester (the robot), the verifier (the appraising authority), and the relying party (the system deciding whether to trust it). Each robot carries a hardware-rooted identity and presents signed evidence about its firmware and policy state. Before it is granted privileged action, that evidence is appraised against known-good reference values. This is the same vocabulary auditors and accreditors use, so the trust decisions are defensible rather than asserted.
Three attestation properties matter most for defense programs. First, identity attestation: a robot proves it is the specific enrolled unit, not a clone or substitute. Second, platform attestation: it proves its running build and configuration match a signed reference, so a downgraded or backdoored image is caught. Third, action attestation: every high-consequence command is authorized and recorded, so there is a verifiable answer to what the robot did and why. RankShield delivers all three as a layer over the existing stack. It does not replace the autonomy software, the controller, or any safety-rated function; it attests the identity and the command path around them.
How do you secure the robotic supply chain?
You secure the robotic supply chain by binding a hardware-rooted identity to each unit at manufacture and then attesting, at every handoff and boot, that the software it runs still matches an authorized, signed reference. Supply-chain risk for defense robotics is not only counterfeit hardware. It is tampered firmware, an unauthorized build slipped in during integration, a downgraded component with a known vulnerability, and the absence of any way to prove which is which after delivery.
Attestation addresses this at two points. At enrollment, each robot generates or receives a private key it never exports, and the program registers the corresponding post-quantum public key as that unit's verifiable identity. From then on, provenance travels with the robot: it can prove which identity it holds and, through RATS firmware attestation, which build and policy it is running. If the running image has been altered, downgraded, or drifted from the signed reference, appraisal fails and the unit is quarantined from privileged action rather than trusted by default.
This is what shifts supply-chain assurance from a paper claim to a checkable one. A software bill of materials and a signed reference value describe what should be running; attestation proves what is actually running, continuously, in the field. RankShield does not manufacture hardware or vet suppliers. It provides the cryptographic binding and the verification flow that let a program detect a counterfeit or tampered unit the moment it tries to act, and reject it. That capability is most valuable when robots pass through multiple integrators and sustainment hands over a long service life.
How does zero-trust apply to robot autonomy?
Zero-trust applies to robot autonomy by never trusting a command because of where it came from, and instead verifying identity, integrity, and authorization at the moment of every high-consequence action. A robot on a trusted network is still a potential adversary if it has been cloned, compromised, or manipulated. Zero-trust for autonomy means the perimeter is not the boundary; the boundary is each individual actuation decision.
RankShield enforces this with a pre-actuation authorization gate that sits between perception-to-action and the actuator and fails closed. A command is authorized only when four conditions hold together: the robot's signature is valid, the robot is enrolled and active, its liveness is fresh, and the specific action is permitted by policy for that unit's role and context. An unsigned, replayed, or out-of-policy command never reaches the motor, and the denial is itself recorded.
This ordering is why the gate neutralizes manipulation of the autonomy stack, including prompt injection against vision-language-action models. Even if an adversary fools the model with a doctored object or sign, the resulting command still has to pass the gate; if it is out of policy, it is denied. For programs, high-risk actions can require human-in-the-loop confirmation or M-of-N authorization. RankShield governs the action a manipulated model produces; it does not certify the model's internal reasoning, and it works only when it sits in front of the actuator. Explored further on the defense robot attestation page.
Why is post-quantum cryptography mandatory for long-life systems?
Post-quantum cryptography is mandatory for defense robotic systems because those systems are fielded for a decade or more, and any long-lived key protected only by classical cryptography is a standing harvest-now-decrypt-later target. An adversary can capture signed traffic and stored credentials today and break them later once a cryptographically relevant quantum computer exists. For a robot with a 10-to-20-year service life, that future is inside the system's own lifetime, so the migration cannot wait.
RankShield issues per-robot identity and signs actions with post-quantum schemes: composite ML-DSA, with SLH-DSA available, aligned to the NIST FIPS 204 and 205 standards. Because the identity key never leaves the robot's hardware root of trust and the signing scheme is quantum-resistant, a credential captured off the wire cannot be forged now or retroactively. This matters most for the two things an adversary would most want to counterfeit: a robot's identity and its authorized commands.
The honest framing is that post-quantum signatures protect the credentials and the command path; they are not a claim that the whole system is unbreakable, and they do not replace transport security or key hygiene. RankShield's post-quantum robot security approach is designed so that programs mandating a move away from classical-only cryptography can adopt quantum-resistant identity and provenance without re-architecting their robots. For systems expected to outlive the classical cryptography protecting them, that is the difference between an identity you can still trust in 2040 and one you cannot.
How is sovereign key custody handled?
Sovereign key custody means the program authority holds its own identity and signing keys in its own hardware roots of trust, so trust never depends on a vendor-held master key that the vendor could use, lose, or be compelled to disclose. For government and defense programs, custody is a sovereignty requirement, not a convenience. Whoever controls the keys controls whether robots can be trusted and revoked, so that control has to sit with the authority, not a supplier.
RankShield is designed for this separation. Each robot's private identity key is generated in and never leaves its hardware element, so no central party ever holds it. The registration and verification authority can run under the program's control, with signing and appraisal keys held in the program's own hardware security modules and trust roots. There is no single vendor master key whose compromise would unravel the fleet; identity is distributed to the units, and custody of the verifying keys is retained by the program.
This custody model also makes revocation and containment a program-controlled action. If a robot is lost, captured, or compromised, the authority can revoke its identity and deny it privileged action instantly, without asking a vendor to act. RankShield provides the attestation and custody architecture; the program provides and holds the keys. We are candid that key custody is only as strong as the operational discipline around it, and that sovereign custody complements, rather than removes the need for, the physical and personnel controls a defense program already runs. The point is that the cryptographic root of trust is yours, not ours.
How do you get after-action accountability?
After-action accountability comes from tamper-evident provenance: every action a robot took, and every action it was denied, is sealed into an append-only transparency log and returned as a receipt that cannot be altered after the fact. After an incident, a program cannot rely on a robot's own logs, because whoever compromised the robot could also edit them. It needs a record that is provably complete and provably unmodified.
RankShield writes each action and its authorization verdict as a leaf in an append-only Merkle transparency log built on the RFC 6962 standard used for certificate transparency. Each receipt includes an inclusion proof, mathematical evidence that the record exists at a fixed position in the log, which an investigator can verify without trusting RankShield. Independent witnesses can co-sign the log's state, so no single party can quietly rewrite history. This turns the record into forensic-grade action provenance rather than an editable diary.
For defense and government oversight, this supports three needs. It supports investigation: reconstructing exactly what a robot did, and what it was authorized to do, in the run-up to an event. It supports accountability: proving to a program authority or oversight body that a system acted within policy, or identifying precisely where it did not. And it supports chain of custody for the evidence itself, because the record's integrity is cryptographic rather than procedural. RankShield records the command path and the verdicts; it does not adjudicate intent or replace investigative authority. What it guarantees is that the record those authorities examine has not been tampered with.
Frequently asked questions
Does RankShield build weapons, targeting, or autonomy systems for defense robots?
No. RankShield is strictly an attestation and authorization layer. It verifies robot identity, appraises firmware, authorizes commanded actions against policy, and records tamper-evident provenance. It does not select targets, control weapons, or provide autonomy or navigation. It complements the program's existing controls rather than replacing any of them.
Can defense programs hold their own keys instead of trusting a vendor master key?
Yes. Each robot's private identity key is generated in its hardware root of trust and never exported, and the verifying and signing keys can be held in the program's own hardware security modules. There is no single vendor-held master key whose compromise would unravel the fleet, which is what sovereign custody requires.
Which post-quantum cryptography does it use for long-life robotic systems?
Per-robot identity and action signing use post-quantum schemes: composite ML-DSA, with SLH-DSA available, aligned to NIST FIPS 204 and 205. This is designed for systems with 10-to-20-year service lives whose long-lived keys would otherwise be exposed to harvest-now-decrypt-later attacks.
How does attestation support zero-trust for autonomous and teleoperated robots?
A deny-by-default pre-actuation gate verifies signature, enrollment, liveness, and policy before every high-consequence action, so no command is trusted because of its network origin. High-risk actions can require human-in-the-loop or M-of-N approval. This governs the action a manipulated or hijacked stack produces; it works only when it sits in front of the actuator.
Is the action record admissible as after-action evidence?
RankShield produces cryptographically tamper-evident receipts on an RFC 6962 transparency log with inclusion proofs and independent witness co-signing, which supports chain of custody and lets an investigator verify the record without trusting RankShield. Whether a given record is admissible in a specific proceeding is a legal determination for the program and its counsel; RankShield provides the verifiable integrity, not the legal ruling.