Quantum-Resilient Cryptography: Why Migration Matters

Lastwall CEO Karl Holmqvist Says Q Day May Arrive Without Warning Mathew J. Schwartz (euroinfosec) • June 17, 2025

Quantum computing poses a serious risk to current encryption systems. While no computer today can crack RSA or ECC algorithms, adversaries are already storing encrypted data with plans to decrypt it later. These "harvest now, decrypt later" attacks expose sensitive data to future compromise in a post-quantum world.

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Karl Holmqvist, founder and CEO of Lastwall, said Q Day - the date when quantum computers can break widely used encryption algorithms - may arrive without warning. Migration to quantum-resilient algorithms must begin now, particularly for critical infrastructure and government systems, he said. FIPS 203, which includes Kyber - formerly known as the Crystals-Kyber algorithm - is a major milestone in standardizing post-quantum encryption for North America and Europe.

"A planned, orderly migration sooner is relevant ...