- Quantum Resource Estimates Suggest Encryption Barriers May Fall Faster Than Expected
- Reducing qubit requirements brings theoretical attacks closer to practical reality
- Bitcoin’s cryptographic underpinnings are under pressure from improving efficiency of quantum algorithms
Google researchers have revised their expectations for the computing requirements needed to break widely used cryptographic systems protecting cryptocurrencies.
The company’s latest white paper claims that a future quantum machine could solve the discrete logarithm of the elliptic curve problem using far fewer resources than expected.
Previous estimates suggested that millions of qubits would be needed to break encryption systems such as secp256k1, which underpin Bitcoin’s security.
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New quantum discoveries reduce cryptographic security timelines
The new results indicate that fewer than 500,000 physical qubits could be enough, representing a substantial reduction in expected hardware requirements.
The research describes two quantum circuit designs capable of executing Shor’s algorithm, requiring fewer than 1,500 logical qubits and tens of millions of quantum gate operations.
Under standard assumptions about hardware performance, these calculations could be performed in minutes on a sufficiently advanced system.
This marks a continuation of incremental improvements in the efficiency of quantum algorithms, rather than a sudden breakthrough in hardware capabilities.
Google states that the intention behind publishing these results is not to create alarm but to encourage preparedness within the cryptocurrency ecosystem.
“We want to raise awareness about this issue and are providing the cryptocurrency community with recommendations to improve security and stability before this is possible, including transitioning blockchains to post-quantum cryptography,” Google executives Ryan Babbush and Hartmut Neven said.
The company has adopted a controlled disclosure strategy, sharing verifiable results via a zero-knowledge proof mechanism, without exposing sensitive implementation details that could allow misuse.
This approach reflects established cybersecurity practices, where vulnerabilities are disclosed in a coordinated manner to allow time to mitigate them.
However, disclosure in blockchain systems introduces additional complexity, as trust in the network plays a direct role in the value of assets.
The researchers note that exaggerated or ill-founded claims could contribute to instability through fear and uncertainty, even in the absence of immediate technical risk.
Most blockchain systems currently rely on elliptic curve cryptography, which remains secure against classical computer attacks but is vulnerable in a quantum scenario.
Google sees post-quantum cryptography as a viable path, noting that alternative algorithms based on more complex mathematical structures are already under development.
These methods aim to resist quantum attacks while maintaining compatibility with existing systems.
Despite the availability of potential solutions, implementation in decentralized networks is expected to be gradual.
The researchers emphasize the importance of early planning, including reducing the exposure of vulnerable wallet addresses and considering policies related to inactive or abandoned digital assets.
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