Page 232 - Cyber Defense eMagazine RSAC Special Edition 2025

The Impact of Quantum Decryption

Understanding the Risks and Preparing for the Quantum Computing Challenge

By Alyssa Walton, Senior Information Security Analyst, Deep Dive Cyber

I. Executive Summary

Quantum computing's rapid progress poses a significant threat, potentially rendering current encryption
methods and nearly all encrypted data vulnerable. This includes sensitive data that has already been
stolen or leaked. Some of this data is being stored in anticipation of future decryption capabilities. This is
typically referred to as “harvest now, decrypt later.” Its eventual decryption could lead to severe financial
losses, major security breaches, and vast global consequences. To counter this threat, an urgent
migration to post-quantum cryptography standards (PQC) is imperative.

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