Post-Quantum Cryptography: Preparing for Q-Day

When quantum computers become sufficiently powerful, they will be able to break RSA and ECC encryption—the foundational mathematical algorithms protecting global financial systems, private communications, and power grids. This milestone is commonly referred to as “Q-Day."

"Harvest Now, Decrypt Later”

The threat isn’t just in the future; it’s happening right now. Malicious actors and nation-states are executing “Harvest Now, Decrypt Later” attacks: capturing and storing encrypted data today so they can decrypt it once quantum hardware arrives.

The Post-Quantum Standards

The National Institute of Standards and Technology (NIST) has finalized new post-quantum cryptographic standards based on mathematical problems (like lattice-based cryptography) that are exponentially hard for both classical and quantum computers to solve.

Upgrading global infrastructure to post-quantum standards will take years, making early migration an urgent priority for enterprise security.