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Post-quantum cryptography (PQC) can help an AI agent prove control of a cryptographic key and protect communications against future quantum-capable attacks. It does not, by itself, prove who deployed the agent, decide what the agent may do, establish that a human delegated authority, or make the agent’s actions safe. A secure design combines cryptographic credentials with enrollment, lifecycle management, authorization, delegation controls, and auditable records.
What post-quantum cryptography contributes to agent identity
An AI agent that can access enterprise data, tools, or applications needs an identity that relying systems can authenticate and a policy that limits what it can do. PQC changes the cryptographic mechanisms that may underpin some of that identity infrastructure; it does not replace the infrastructure or its policies.
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NIST’s finalized PQC standards have distinct roles. The Secretary of Commerce approved the first three on August 13, 2024. FIPS 204 specifies ML-DSA and FIPS 205 specifies SLH-DSA, both digital signature schemes. FIPS 203 specifies ML-KEM, a key-encapsulation mechanism used to establish shared secret material between parties over a public channel; it is not an agent-signing algorithm. Implementers should consult the current NIST standard pages and errata for the applicable versions.
| Mechanism | Standard and role | Relevance to agent systems |
|---|---|---|
| ML-DSA | NIST FIPS 204; digital signatures | Can sign data or support authentication based on control of a private key. |
| SLH-DSA | NIST FIPS 205; digital signatures | Another standardized signature scheme for authentication and data integrity. |
| ML-KEM | NIST FIPS 203; key encapsulation | Establishes shared secret material for protocols; it does not sign an agent identity. |
NIST describes digital signatures as a way to detect unauthorized changes and authenticate the identity of the signatory. In an agent deployment, that identity is only as meaningful as the enrollment process, the association between the credential and the agent or organization, key custody, credential status, and the verifier’s policy. A valid signature alone does not establish that the signer is an authorized agent or that a particular action is allowed.
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PQC uses mathematical techniques intended to resist attacks from both conventional and potential quantum computers. It is not the same as quantum cryptography, which relies on quantum physics. The practical goal is to prepare cryptographic systems for the possibility that future quantum computers could undermine some currently used public-key mechanisms.
Build an agent identity around its full lifecycle
NIST NCCoE’s February 5, 2026 concept paper, Accelerating the Adoption of Software and Artificial Intelligence Agent Identity and Authorization, explores how existing identity practices might apply to agents. It is a proposed, implementation-oriented project, not a completed standard defining secure agent identity. Its public comment period ran from February 5 to April 2, 2026. The questions it raises offer a practical design checklist.
Define what the identity represents
Decide whether an identity belongs to a software agent, a deployed instance, a workload, an organization, or some combination. A stable service identity can make it easier to manage a persistent agent, while task-specific context may be necessary to distinguish what that agent is doing at a particular moment. Record enough metadata for relying systems and auditors to identify the relevant agent and deployment boundary.
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Enroll, issue, rotate, and revoke credentials
Specify who may enroll an agent, what evidence links it to an owner or deployment, which authority issues its credentials, and how those credentials are updated or revoked. Define procedures for key rotation, suspension, compromise response, and recovery. A PQC algorithm cannot compensate for an issuance process that binds a key to the wrong workload or leaves a compromised credential active.
Authorize actions separately from authentication
After authenticating an agent, a relying system still needs to decide whether the requested action is permitted. Apply least privilege and evaluate permissions in context: the task, the resource, the tool being invoked, and any relevant approval should all inform the decision. Reassess access when an agent’s task or available tools change rather than treating a successful login as blanket permission.
Bind delegated authority to its source
When an agent acts on behalf of a person or service, preserve the relationship between the agent, the delegated authority, and the approving principal. Make clear what was delegated, for which purpose, and under what limits. Where a consequential action needs human approval, bind the approval to the specific action or scope instead of treating a general user login as authorization for every later agent action.
Make activity attributable and reviewable
Keep records that link actions to the agent identity, the applicable authorization, and any human approval. Protect logs against undetected alteration and make them verifiable by the people responsible for incident response and audit. A signature can help protect signed records from undetected modification, but logging policy must still define what is recorded, how records are protected, and how they are interpreted.
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Authentication answers who or what presented a credential; it does not make instructions received by the agent trustworthy. Direct or indirect prompt injection requires preventive and impact-limiting controls, such as restricting tools and data to the task, controlling consequential actions, and requiring review where appropriate. Treat these as separate safeguards in the agent’s security design, not as a feature supplied by PQC.
Fit PQC into identity and federation infrastructure
Agent credentials operate within a larger chain of systems. NIST’s PIV PQC overview identifies changes that may affect algorithm profiles, authenticator interfaces, credential data models, derived-credential guidance, and federation. For federated identity, PQC readiness also reaches protocols such as OpenID Connect and SAML, the cryptographic libraries and key-management practices of identity providers and relying parties, and TLS connections that protect transactions.
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OAuth 2.0, OAuth 2.1, and OpenID Connect may be part of an agent’s authorization and authentication plumbing, but using those protocols does not automatically create post-quantum agent identity. The cryptographic profiles, tokens, certificates, clients, and supporting transport must fit the system’s threat model and migration plan.
NIST expects classical and PQC mechanisms to coexist during migration so organizations can preserve existing structures and interoperability. That makes compatibility an architectural concern: a credential’s algorithm must be supported across the systems that issue, store, present, verify, and rely on it.
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There is no single credential-storage choice established for every AI agent. Depending on the deployment, keys may be managed in software, by a cloud identity platform, in an HSM, or through a device-backed authenticator. The right choice depends on the sensitivity of the workloads and data, operational requirements, support for the required standards, and compatibility with the rest of the identity stack.
Physical-product evidence should be read narrowly. The U.S. General Services Administration documented a PIV experiment using beta firmware on an NXP P71D600-based ZTPass smart card to test Dilithium levels 2, 3, and 5. In the same experiment, YubiKey 5.7 was listed in RSA credential configurations and a hybrid Ed25519 configuration. This does not establish that an ordinary retail YubiKey supports PQC signatures, nor does it make a consumer security key a suitable ML-DSA credential by default.
The PKI Consortium’s PQC Capabilities Matrix lists software, libraries, and hardware related to PKI, certificate lifecycle, signing, and HSM offerings. The consortium describes the matrix as a living starting point, does not endorse implementation quality, and warns that capabilities can change. Treat entries as candidates for direct vendor verification, not as certification or proof that a product meets a deployment’s requirements.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Plan migration as an interoperability project
UK National Cyber Security Centre guidance recommends a staged approach where needed, cryptographic agility, integration and interoperability testing, business continuity planning, and rollback planning. For enterprise PKI, one possible pattern is to deploy a parallel PQC root and issue new credentials while classical and PQC PKI operate concurrently. A controlled cutover may be appropriate in other environments, but only where dependent systems can support it.
- Map cryptographic dependencies. Identify agent credentials, certificate authorities, identity providers, authenticators, relying applications, federation connections, TLS links, libraries, and key-management services that participate in authentication or authorization.
- Define the identity and policy model. Document what each agent identity represents, how it is enrolled and linked to an owner, what it may access, how delegation works, and how actions and approvals are recorded.
- Check standards and product support. Verify current algorithm and protocol support across every issuer, client, verifier, and relying application. Confirm details directly with vendors and consult current NIST standards and errata rather than relying on a product label or a secondary summary.
- Test coexistence and failure paths. Exercise credential issuance, authentication, authorization, rotation, revocation, and recovery across the classical and PQC components that must interoperate. Include business continuity and rollback scenarios before changing production dependencies.
- Adopt with controlled scope. Migrate in stages where compatibility or operational risk requires it, and retain the ability to change algorithm suites as standards and support evolve.
Cryptographic agility means designing systems so algorithm suites can change without rebuilding the entire identity architecture. NCSC advises most organizations to use trusted implementations rather than develop bespoke cryptography. The challenge is not merely selecting a PQC algorithm; it is ensuring that credentials, protocols, applications, and operational procedures continue to work together as the change is introduced.
What a PQC-enabled agent identity can—and cannot—claim
A carefully deployed PQC signature can support authentication of key control and integrity protection for signed data using a standardized signature scheme. A PQC key-establishment mechanism can contribute to shared-secret establishment in a supported protocol. Those are useful cryptographic properties, but they do not independently show that an agent’s software is safe, that its operator is legitimate, that a human authorized a particular task, or that its requested action complies with policy.
NIST’s agent identity work is still framed as a concept for exploring how existing standards and practices might be applied. Organizations can prepare by clarifying agent identity, lifecycle, delegated authority, authorization, audit, and prompt-injection controls while assessing PQC compatibility across their identity stack. For implementation, use current NIST standards and errata, test interoperability with the actual relying systems, and verify vendor capabilities directly.
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