Quantum computing is no longer a theoretical threat. With recent advances from Google, IBM, and Chinese laboratories, experts estimate that the first quantum computers capable of breaking current encryption systems – the famous 'Q-Day' – could appear as early as 2029, three years earlier than expected.
Faced with this existential threat, companies and governments are accelerating the transition to post-quantum cryptography. The US NIST has finalized its four quantum-computer-resistant encryption algorithms, and their adoption is now mandatory for all US federal critical infrastructures.
Banks are on the front lines. JPMorgan Chase has announced a $2 billion investment in migrating its systems to post-quantum protocols. "This is the biggest security upgrade in the history of finance," said its Chief Information Security Officer.
The 'Harvest Now, Decrypt Later' (HNDL) threat is particularly concerning: state actors are massively intercepting and storing currently encrypted data, anticipating being able to decrypt it tomorrow with quantum computers. Medical, banking, and diplomatic data are the priority targets.
Paradoxically, quantum computing also offers new security solutions, such as Quantum Key Distribution (QKD), which enables theoretically unbreakable encryption based on the laws of quantum physics. China has deployed the first operational QKD network connecting Beijing to Shanghai over 2,000 km.
Europe is preparing its response with EuroQCI, a pan-European quantum communication network expected to be operational by 2028, connecting the 27 member states in a common quantum shield.
