Public Key Infrastructure explained
PKI is the trust backbone behind much of modern security. It's based on pairs of cryptographic keys — a public key that can be shared freely and a private key kept secret. Digital certificates, issued and vouched for by trusted Certificate Authorities, bind a public key to a verified identity (a website, a server, a person, or a device), so others can confirm who they're really communicating with.
This infrastructure underpins everyday security people rarely think about: the padlock and TLS/SSL encryption on websites, the signatures that prove an email or document is authentic, secure VPN connections, and device authentication. Wherever you need to prove identity or establish encrypted, tamper-evident communication, PKI is doing the work underneath.
Why PKI matters for your business
Without a way to verify identity and establish trust, encryption alone isn't enough — you could be encrypting data straight to an attacker impersonating a trusted party. PKI solves that by providing verifiable digital identity, which is foundational to secure web traffic, email, remote access, and modern zero-trust security.
Managing PKI well also matters operationally. Expired or misconfigured certificates routinely cause outages and security warnings that erode trust, and weak certificate practices can be exploited. Getting PKI right keeps both security and availability intact.
Scalogic manages your certificates and trust
Scalogic manages the PKI and certificates your business relies on as part of our cybersecurity and infrastructure services. We deploy and renew the certificates that secure your websites, email, servers, and remote access, and prevent the expired-certificate outages and warnings that catch many organizations off guard.
We use PKI to strengthen identity and encryption across your environment — from TLS/SSL to device authentication — as part of a layered, zero-trust security posture.
Frequently asked questions
What is PKI used for?
Securing websites (TLS/SSL), signing email and documents, authenticating devices and users, and establishing encrypted, trusted communication across systems.
What happens if a certificate expires?
Services can go down or show security warnings that erode trust. Scalogic tracks and renews certificates to prevent these avoidable outages.
How does PKI relate to encryption?
Encryption scrambles data; PKI provides the verified identity and key exchange that ensures you're encrypting to the right, trusted party.