---
title: "Public key infrastructure (PKI) solutions"
description: "Overview of Lacuna's PKI solutions (Web PKI, Rest PKI, PKI SDK and PKI Express) and guidance on choosing the right product for your scenario."
canonical: "https://docs.lacunasoftware.com/en-us/articles/pki-guide"
locale: "en"
product: "PKI guide"
last_updated: "2026-07-14"
---

# Public key infrastructure (PKI) solutions

We have a complete line of solutions for Public Key Infrastructure (PKI):

* [Web PKI](https://docs.lacunasoftware.com/en-us/articles/web-pki) - a browser plugin for accessing the user's digital certificates on web pages
* [Rest PKI](https://docs.lacunasoftware.com/en-us/articles/rest-pki) - a cloud-service for performing PKI operations on virtually any programming language
* [PKI SDK](https://docs.lacunasoftware.com/en-us/articles/pki-sdk) - a software development kit for .NET applications for performing PKI operations
* [PKI Express](https://docs.lacunasoftware.com/en-us/articles/pki-express) - a solution for performing PKI operations on virtually any programming language and that can be hosted on both Windows and Linux servers.

The choice of which product (or combination of products) is right for your project depends on your scenario and what
you're trying to accomplish. Read the article below that most closely matches your case to find out how to best
implement it with our products:

* **[Web signatures](https://docs.lacunasoftware.com/en-us/articles/pki-guide/web-signatures)** - perform [digital signatures](https://docs.lacunasoftware.com/en-us/articles/pki-guide/signatures) on web pages
* [Server signatures](https://docs.lacunasoftware.com/en-us/articles/pki-guide/server-signatures) - perform digital signatures entirely on the backend, with keys located on the server
* [Certificate authentication](https://docs.lacunasoftware.com/en-us/articles/pki-guide/cert-auth) - authenticate users based on their digital certificates
* [Test Certificates](https://docs.lacunasoftware.com/en-us/articles/pki-guide/test-certs) - use our test certificates for development purposes