Public Key Infrastructure
Also known as: PKI
Definition
PKI is the set of services, policies, and cryptographic mechanisms that create and manage trusted digital identities using public and private keys and certificates.
Key Points
- It issues certificates and binds keys to identities.
- It supports encryption, signing, and authentication.
- It is essential for machine trust at scale.
- It underpins many secure device and service relationships.
- It becomes operationally expensive if lifecycle management is weak.
Concept
PKI is the trust plumbing behind secure automation. A certificate lets one system prove who it is, and revocation or expiration lets the network stop trusting it when needed. Without PKI, encryption may still exist, but identity and lifecycle control become much harder to manage across a fleet of devices and services.
Explainer
For ConnectedEarth use cases, PKI is most important where devices and services must authenticate each other without human intervention. That includes firewalls, remote operations, industrial gateways, and digitally coordinated platforms. If certificate hygiene is poor, the trust layer fails long before the cryptography itself does.
Cite this entry
Public Key Infrastructure. ConnectedEarth Knowledge Base. https://connectedearth.space/knowledge-base/public-key-infrastructure/ (updated 13 September 2026).