What Communications Companies Need to Know Before Q-Day

This commentary explains the implications of NIST's finalized post-quantum cryptography algorithms and urges the ICT industry to adopt hybrid classical/PQC approaches, prioritize crypto agility and interoperability, and implement defense-in-depth (including QKD and preshared symmetric keys) to counter harvest-now-decrypt-later threats ahead of "Q-Day"; it highlights ongoing standardization (IETF, 3GPP) and early adopters (Apple iMessage, AWS Kyber) while emphasizing staged migrations and rigorous testing during the transition.