What Every C-Suite Executive Needs to Know About Post-Quantum Cryptography

**Executive summary:** Google’s updated Q‑Day estimate (~2029) and recent industry analysis sharpen the urgency of the ‘harvest-now, decrypt-later’ threat where adversaries collect encrypted data today for future decryption by quantum computers; the document explains the risk, summarizes NIST/CISA migration timelines and approved PQC standards, and urges organizations to start cryptographic inventories, engage vendors, and begin PQC migration planning now.