Learn · Machine Identity

The identity layer behind modern infrastructure.

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Every server, service, container, and workload needs to prove who it is. Machine identities — largely certificates and keys — now vastly outnumber human ones, and managing them is its own discipline.

Try a free domain scan Why it matters
8 min readStrategic
Identities in modern infra
Usershuman identities
Machinesservers · devicesmachine
Servicesapps · APIsmachine
Containerspods · functionsmachine
Definition

Machine identity management is the practice of issuing, securing, and governing the identities of non-human entities — servers, services, devices, containers, and workloads — which authenticate using certificates, keys, and tokens rather than passwords.

Human vs machine

Most of your identities
aren’t people.

Identity programs were built for humans. But the fastest-growing, most numerous identities in any modern estate are machines — and certificates are how they prove themselves.

Human identities

People authenticate with passwords, MFA, and SSO — a well-established discipline.

Machine identities

Machines authenticate with certificates and keys — issued, rotated, and revoked at scale.

Exploding in number

Cloud, microservices, and containers mean machine identities now far outnumber humans.

Short-lived by design

Modern machine identities rotate constantly, demanding automation.

Why it matters

Machine identity is the
new perimeter.

Explosive growth

Machine identities multiply with every service and container.

Certificates are central

Most machine identity is rooted in TLS certificates.

Visibility gap

Few teams can say how many machine identities they have.

Attack surface

Unmanaged machine identities are a real security risk.

Automation required

Short lifetimes make manual management impossible.

47-day acceleration

Shorter certs mean even more identity churn.

FAQ

Machine identity,
answered.

A machine identity is the credential a non-human entity — a server, service, application, device, container, or workload — uses to authenticate and communicate securely. In practice, machine identities are largely TLS certificates and cryptographic keys.
Humans authenticate with passwords, MFA, and single sign-on. Machines authenticate with certificates, keys, and tokens — issued, rotated, and revoked programmatically and at far greater scale.
Cloud computing, microservices, containers, and service meshes mean every workload needs its own identity. As a result, machine identities now vastly outnumber human ones in most organizations.
Unmanaged or expired machine identities cause outages and create security gaps. As machines become the dominant identity type, managing them well is essential to both reliability and security.
Certificates are the most common form of machine identity. Managing machine identities is, to a large degree, managing the certificate lifecycle — discovery, monitoring, and automated renewal.
Mutual TLS and Kubernetes service meshes assign certificate-based identities to services, generating large volumes of short-lived machine identities that must be automated.
Shorter certificate lifetimes mean machine identities rotate even more frequently, making automated issuance, renewal, and discovery a hard requirement.
MachineCert discovers every certificate-based machine identity across public, cloud, and internal systems, maps their relationships and ownership, monitors risk and expiry, and automates renewal — giving organizations control over their machine identity layer.
Keep learning

Related topics

Certificate lifecycle managementThe lifecycle, explained.Workload identityHow workloads authenticate.mTLS automationTrust between services.Machine Trust GraphMap machine relationships.Certificate discoveryFind every machine identity.MethodologyOur approach to machine trust.
See it in practice

See your machine identities.

Run a free domain scan to discover the certificate-based machine identities across your infrastructure.

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