A quantum computing deadline looms. It threatens to kick off the biggest cybersecurity crisis ever

The clock is ticking on Q-Day, the looming yet unknown date when quantum computing will have the capacity to quickly and easily break the encryption keys that keep most internet communication safe.

Experts have known about the hypothetical risk of Q-Day since the 1990s. But Google recently warned that quantum computers may be able to hack some encrypted systems by 2029 — a timeline that drastically narrows the window to safeguard data that many cybersecurity specialists had previously predicted. The new estimate means that governments, companies and other entities may have far less time to prepare.

“It’s the day when people, perhaps adversaries, will have access to a quantum computer that can break cryptographic codes that are in use,” said Michele Mosca, cofounder and CEO of cybersecurity company evolutionQ.

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