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The ABCs of Harvest and Decrypt

Philip Lafrance
Feb 24, 2025

As large-scale quantum computing inches ever closer, the urgency to protect our digital assets now from future threats is growing. Around the world, organizations of all kinds are being strongly encouraged to start preparing for quantum-capable adversaries. And for several very good reasons. If you’re familiar with the quantum-threat to cryptography, you’ve likely heard that current encryption algorithms are vulnerable to quantum computing attacks. You may have come across discussions about post-quantum cryptography standards. And perhaps you’ve heard that today’s encrypted data could be at risk from tomorrow’s quantum-enabled attackers.

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Lattice-Based Cryptography

Victoria de Quehen
Sep 21, 2021

Lattice-based cryptography is the most important area of quantum-safe cryptography and is known for its efficiency and versatility. Its use cases range from the foundational building blocks of cryptography…

Math Paths to Quantum-safe Security: Hash-based Cryptography

Victoria de Quehen
Feb 24, 2020

Digital signature algorithms are a critical component of public-key infrastructure, with applications ranging from code signing to establishing secure connections. However, classical digital signature…

Math Paths to Quantum-Safe Security: Isogeny-Based Cryptography

Victoria de Quehen
Jul 27, 2018

One of the most widely deployed public-key cryptographic algorithms is the elliptic curve Diffie-Hellman key exchange (ECDH). This, as well as most currently used protocols, is vulnerable to attacks using…

A Short History of Public Key Cryptography

Victoria de Quehen
Jun 14, 2018

While the ideal of public-key cryptography is to have a “set and forget” group of algorithms that will guarantee security forever, increasingly we are realizing this ideal is not viable. There is not one…