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Ethereum's Kohaku lead says the network can protect user accounts against quantum-computing attacks for just seven cents, pointing to a proposal built around the SPHINCS+ signature scheme as a near-term solution.
The proposal's stated goal is to reduce the cost of post-quantum signature verification while Ethereum builds toward a longer-term fix.
That price point, if it holds, would make quantum resistance accessible to ordinary users rather than an expensive edge case.
What SPHINCS+ Does and Why Cost Has Been the Barrier Post-quantum signatures replace the cryptographic assumptions underpinning standard Ethereum accounts — assumptions that a sufficiently powerful quantum computer could eventually break — with schemes designed to resist such attacks.
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