Google Research Reveals Potential Vulnerability of Bitcoin's Digital Signatures to Quantum Attacks

A new study has shed light on the potential vulnerability of Bitcoin's digital signatures to quantum attacks.

The research, led by Google in collaboration with the Ethereum Foundation and Stanford researchers, suggests that a quantum computer with 1,200 logical qubits could theoretically break secp256k1, the elliptic curve used for Bitcoin's digital signatures. This is a significant reduction from previous estimates, which suggested that at least 70 million logical qubits would be required.

However, it's essential to note that current quantum processors operate on noisy physical qubits and require sustained fault-tolerant error correction to execute the attack. The actual number of physical qubits needed to break the cryptography is estimated to be around 500,000.

The research team also identified two potential attack vectors: at-rest attacks targeting exposed public keys and on-spend attacks intercepting transactions in the mempool. While these threats are being taken seriously, the current state-of-the-art processors lack the capability to execute such an attack.