While much of the world’s attention is focused on the race for dominance in artificial intelligence (AI), a new development from China in the realm of quantum cryptography is raising significant concerns about the future of data security. Chinese researchers, led by Professor Wang Chao from Shanghai University, have achieved a groundbreaking feat by successfully factoring a 90-bit RSA integer using a D-Wave Advantage quantum computer—a task once thought to be out of reach for contemporary quantum systems.
Quantum cryptography, a field dedicated to leveraging the unique properties of quantum mechanics for encryption, has seen rapid progress. In this high-stakes race, the implications are profound, as quantum computing could one day enable systems to crack virtually any encryption, rendering current data security protocols obsolete. This recent breakthrough, which pushes the envelope of quantum cryptographic research, may bring the world closer to a feared event often referred to as “Q-Day,” the point at which quantum computers could break the most secure encryption in use today.
Historically, RSA encryption, a system relied upon by countless industries to secure communications, is based on the mathematical difficulty of factoring large numbers. The security of RSA relies on the belief that factoring large integers is a computationally expensive task. However, until now, no quantum computer had been able to perform this task at scale.
In 2023, experts at Google and IonQ (a U.S.-based quantum computing company) concluded that factoring RSA numbers above 80-bits was still a near-impossible task for existing quantum technology. In fact, Google’s 2024 launch of its quantum chip, Willow, has not yet succeeded in performing cryptographic attacks. However, Wang’s team shattered this barrier by factoring a 90-bit RSA integer using quantum annealing, a technique that utilizes quantum mechanics to find optimal solutions for complex problems.
The D-Wave Advantage quantum computer, which Wang’s team used, operates with 5,760 qubits. Unlike traditional bits, qubits can exist in multiple states simultaneously, offering the possibility of vastly superior computational power. By combining quantum annealing algorithms with classical cryptographic methods, Wang’s team was able to tackle the RSA factorization problem far more efficiently than previous attempts. This achievement sets a new benchmark in the field and opens the door to even larger quantum-powered cryptographic challenges.
Despite the breakthrough, experts stress that this is not the end of RSA encryption’s viability. Current RSA systems use keys that are at least 2,048 bits long—well beyond the 90-bit milestone achieved by Wang’s team. However, the methods employed by Wang’s team may eventually be scalable to larger, more complex problems, making them a potential threat to the security of the future.
This development comes at a time when cryptographers and cybersecurity experts are scrambling to prepare for the quantum threat. Post-quantum cryptography—a set of encryption protocols designed to resist quantum attacks—has become a hot topic in the industry. With the threat of quantum computers becoming a reality, many sectors, especially those in banking, blockchain, and government services, are urgently seeking ways to protect sensitive data.
Quantum migration—the practice of transitioning to more advanced encryption methods—has already begun as a way to safeguard data that could eventually be decrypted by future quantum computers. Wang himself acknowledges that this race between quantum-enabled encryption and decryption is dynamic and fast-moving. “Quantum computing may evolve faster than expected,” he warned, adding that sometimes the paths of attack and defense don’t align, creating new complexities for the security landscape.
While Wang’s team’s success may not immediately spell disaster for RSA encryption, it signals the growing urgency to upgrade current encryption systems. Quantum computing’s potential in cryptography is immense, but so too are the challenges in ensuring the security of future information systems. With the arms race between encryption and decryption continuing to accelerate, the next few years will likely prove critical in shaping how secure our data truly is in the quantum age.
