TLDR Tech / Crypto
Towards Native Post-Quantum Private ETH
Harvest-now-decrypt-later (HNDL) vulnerabilities make reactive quantum-resistance approaches, including turnstile mechanisms and proof system swaps, insufficient for private ETH. The ~620k shielded ZEC pool in Zcash's Sapling (~$250M) illustrates the scale of value exposed to future quantum decryption. A proposal on ethresear.ch calls for proactive, L1-native quantum-resistant cryptography, recommending hash-based proof systems (WHIR and STIR constructions) over lattice-based alternatives for their support of larger circuits. For encryption, ML-KEM (Kyber) replaces traditional key agreement with key encapsulation, SPHINCS+ covers stateless spending authorization, and PRF-based derivation handles key management without exotic primitives. A phased "progressive pool uncapping" mechanism would expand deposit limits during early deployment to bound risk exposure.
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