05-27, 15:00–15:25 (CET), Flower
Among PQ signature schemes—hash-based, multivariate, lattice-based, and isogeny-based—the cryptographic community favors lattice-based approaches due to their balance of security and efficiency.
FALCON and DILITHIUM, both selected by NIST, offer strong security guarantees but require optimizations to meet Ethereum’s gas cost, storage, and execution constraints.
Our team has developed client-side, and on-chain implementations of FALCON and DILITHIUM, achieving a 12x gas cost reduction compared to previous implementations. We introduce ETHFALCON and ETHDILITHIUM, variants specifically tuned for Ethereum, and ZK constraints, ensuring security equivalence with existing cryptographic standards while significantly improving efficiency.
This talk presents:
A breakdown of Ethereum’s vulnerabilities under quantum threats
A comparison of post-quantum signature candidates and their trade-offs in blockchain environments
Benchmarks of our optimized smart contract verifiers, achieving substantial gas savings
The feasibility of hardware-based PQ signing solutions and their impact on security and usability
The roadmap for integrating PQC into Ethereum, including its intersection with zero-knowledge proofs (ZK)
By bridging PQ cryptography and Ethereum’s constraints, we provide a concrete path toward a quantum-resistant blockchain future.
Dubois Renaud - Cryptologist with 20 years of experience (Thales Defense, Ledger). Realizations include several publications and patents, and delivering the fastest generic ecc implementations, including passkeys integrated in Coinbase Smart Wallet.