A revolution of promise and peril

These incredible new computers will fundamentally change the way we think about and apply long-trusted security measures. To understand this challenge, we need to understand quantum computing itself, and what it means to live in a quantum world.

Post-Quantum Cryptography for Dummies, DigiCert Custom Edition, is your guide to both quantum computing and how applications of quantum will change and challenge everything digital. Now updated for 2026, this edition adds timely context on why preparing for PQC is part of a broader shift toward modernizing PKI and building cryptographic agility as machine identities grow, certificates shorten, AI adoption accelerates, and standards continue to evolve.