QUANTUM COMPUTINGAND CYBERSECURITY
A comprehensive guide to how quantum computers threaten current encryption, what stays secure, and how to build a quantum-resilient cybersecurity program.
The Quantum Threat Landscape
Cryptographic Collapse
RSA, ECC, and Diffie-Hellman will be broken by quantum algorithms. TLS, VPN, SSH, and PKI all rely on these systems.
Harvest Now, Decrypt Later
Adversaries steal encrypted data today to decrypt when quantum computers arrive. Long-lived data is already at risk.
Digital Signature Forgery
Quantum computers can forge digital signatures, undermining code signing, document authentication, and transaction integrity.
Quantum Defensive Tools
Quantum computing also enables new defensive capabilities like quantum key distribution and quantum random number generation.
How Quantum Reshapes the Security Stack
Transport Security
TLS, VPN, and SSH connections all use key exchange algorithms that quantum computers will break.
PKI and Identity
Certificate authorities and digital identity systems built on RSA/ECC need migration to PQC signatures.
Code Signing
Software supply chain integrity depends on digital signatures vulnerable to quantum forgery.
IoT and OT Systems
Embedded systems with long field lifetimes cannot easily be updated, creating persistent vulnerabilities.
Frequently Asked Questions
When will quantum computers break current encryption?
Most experts estimate cryptographically relevant quantum computers by 2030 to 2035. However, the harvest-now-decrypt-later threat means sensitive data is already at risk today.
Is AES-256 safe from quantum computers?
AES-256 remains quantum-resistant for symmetric encryption. However, the key exchange mechanisms used to distribute AES keys (RSA, ECDH) are vulnerable. You need PQC for key exchange.
What should my organization do first?
Start with a quantum readiness assessment to inventory your cryptographic systems and understand your exposure.
Related Resources
Assess Your Quantum Risk
Start with a quantum readiness assessment to understand your exposure and build a migration roadmap.