Quantum Test Breaks ECC Key, Raises New Bitcoin Security Concerns

Researcher breaks ECC key using quantum hardware, raising concerns about Bitcoin security and urging faster shift to post-quantum protection systems.

A breakthrough in quantum computing has raised serious cybersecurity concerns worldwide. Giancarlo Lelli, an independent researcher, recently cracked a 15-bit elliptic curve key with public quantum hardware. Moreover, this achievement earned him a 1 Bitcoin reward and global attention.

Quantum Breakthrough Shows Real Progress in Crypto Attacks

The experiment was part of a challenge by Project Eleven. The group awarded the Q-Day Prize to Lelli for completing the task successfully. This is the largest public demonstration of a quantum attack on elliptic curve cryptography.

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Elliptic curve cryptography (ECC) is used to secure many blockchain systems. Bitcoin and Ethereum use this method for signatures, for instance. So, cracking a small ECC key is a step towards better quantum attacks.

Lelli applied a quantum algorithm called Shor’s algorithm. This algorithm is directed at the Elliptic Curve Discrete Logarithm Problem (ECDLP), which secures cryptocurrency wallets. This allowed him to obtain a private key from a public key.

While the experiment was conducted on a 15-bit key, it is significant. The key space contained 32,767 possible keys, which were searched. As a result, this is now considered an improvement on previous tests.

Indeed, a test in 2025 only cracked a 6-bit key. So, this new experiment is 512 times more sophisticated. It demonstrates the rapid improvement in quantum technology.

Growing Risks Push Need for Post-Quantum Security

However, it is still much more difficult to break a 256-bit key. However, recent studies suggest the gap is shrinking quickly. Estimates now show that around 500,000 qubits may be needed for such an attack.

Some newer research even suggests the requirement could drop further to 10,000 qubits. So, it is thought that the problem is becoming more of an engineering one. This could allow for future attacks.

There are currently 6.9 million Bitcoins stored in wallets with public keys. These wallets could be at risk if quantum attacks become more effective. As a result, the crypto industry is closely watching these developments.

Moreover, the value of assets protected by ECC is over $2.5 trillion worldwide. This includes numerous blockchain networks. So, the threats are not limited to one cryptocurrency.

The tech industry is also taking these risks seriously. Others are already preparing for quantum-safe systems. For instance, Google plans to be quantum-safe by 2029.

Now, experts are urging the need for post-quantum cryptography. This is a cryptography that is resistant to quantum computers. So, developers will likely have to upgrade blockchain systems in the near future.

Meanwhile, researchers are working on new issues in this space. Project Eleven is already looking to conduct more tests using artificial intelligence and quantum analysis. These efforts aim to better understand and reduce future risks.

Overall, the 15-bit key break shows the progress in quantum computing. Although large-scale attacks are not feasible yet, the trajectory is clear. Therefore, early preparation and stronger security systems will be critical for the future of crypto markets.