Currently, Ethereum uses the BLS scheme to aggregate votes on valid blocks, which is not quantum safe.
Also, the “KZG” commitment scheme is used in several places across Ethereum to generate cryptographic secrets.
They’re researching and prototyping two new signature schemes: STARK-based(opens in a new tab) and lattice-based(opens in a new tab).
Ethereum aims to be secure for centuries, so it's planning for a future with quantum computing.
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