What public key infrastructure is
Public key infrastructure, or PKI, is the system of roles, policies, and processes that manages digital certificates and public-key encryption. It provides the framework that lets people and systems trust that a public key really belongs to who it claims to. PKI underpins much of secure communication online, making it possible to verify identities and exchange information securely.
Managing digital certificates
A central part of PKI is the management of digital certificates. A certificate links a public key to an identity, vouching that the key belongs to a particular person, organization, or system. PKI handles how these certificates are issued, distributed, and, when necessary, revoked. This management is what allows certificates to be trusted and used reliably.
The role of certificate authorities
PKI relies on trusted entities called certificate authorities, which issue and vouch for digital certificates. When a certificate authority signs a certificate, it is attesting that the identity and public key it contains are legitimate. Because these authorities are trusted, others can rely on the certificates they issue. This chain of trust is a foundation of how PKI works.
Enabling trust and encryption
The purpose of PKI is to enable trust and secure communication using public-key encryption. By confirming that a public key genuinely belongs to a particular party, PKI lets people encrypt information for the right recipient and verify signatures. This ability to trust keys and identities is what makes secure online interactions, such as protected web browsing, possible.
Why PKI matters
Public key infrastructure matters because it provides the trust framework behind much of secure digital communication, from protected websites to verified identities. Without it, knowing whether a public key is genuine would be very difficult. Understanding what PKI is clarifies the system that makes public-key encryption trustworthy and practical at scale.
Why it matters
Public key infrastructure is a fundamental part of digital security. Understanding what it is - the system that manages certificates and public keys to enable trust - clarifies how secure communication is made possible. For anyone interested in cybersecurity, it is a valuable concept to understand.
Related on Skillo
See also: What is a digital signature? Explained, What is a security token? Explained.
Sources
Published date reflects the original event date (2026-10-22). This article is original Skillo editorial written from the sources above; facts were verified in September 2026.
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