BNB Smart Chain Shows Quantum-Safe Crypto Works Despite 50% Throughput Drop

BNB Smart Chain completed a large-scale test of quantum-resistant cryptography to prepare for future quantum threats. The work replaces transaction signature algorithms and upgrades consensus-layer vote aggregation using post-quantum alternatives standardized by the U.S. National Institute of Standards and Technology. Traditional ECDSA and BLS signatures are targeted for replacement with ML-DSA-44 under NIST FIPS 204, while consensus vote aggregation is upgraded using pqSTARK proofs. The changes improve theoretical resistance to quantum attacks, including those enabled by Shor’s algorithm against elliptic-curve cryptography. Practical limitations appear as transaction size increases from about 110 bytes to roughly 2.5 kilobytes, block sizes rise from about 130 kilobytes to nearly 2 megabytes, and throughput falls 40%–50% depending on workload and propagation time.

"BNB Smart Chain developers have completed a large-scale test of quantum-resistant cryptography, offering one of the clearest demonstrations yet that blockchain networks can migrate away from vulnerable encryption systems before quantum computing becomes a practical threat. The research centers on replacing the cryptographic algorithms currently used to secure transactions and validator consensus with post-quantum alternatives standardized by the U.S. National Institute of Standards and Technology."

"The BNB Smart Chain proposal replaces traditional transaction signatures with ML-DSA-44, a lattice-based signature algorithm standardized under NIST's FIPS 204 framework. Consensus-layer vote aggregation is simultaneously upgraded using pqSTARK proofs. The changes significantly improve theoretical resistance to quantum attacks, but they also expose the practical limitations of today's blockchain infrastructure."

"Under the new framework, average transaction size rises from roughly 110 bytes to about 2.5 kilobytes. At the network level, block sizes increase from around 130 kilobytes to nearly 2 megabytes under equivalent transaction loads. In testing, throughput dropped between 40% and 50% depending on workload conditions."

"While experts widely agree that quantum computers capable of breaking modern blockchain encryption are still years away, the industry has begun preparing for a future in which current systems such as ECDSA and BLS signatures may no longer be secure. Shor's algorithm, a quantum computing technique, is theoretically capable of compromising the elliptic-curve cryptography underpinning most major blockchain networks."

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