Sui to add quantum-safe signatures Q1 2027 mainnet upgrade

The Sui blockchain network is preparing to introduce optional quantum-resistant security features, announcing plans to integrate two U.S. government-approved post-quantum signature schemes. The move is designed to protect user accounts and high-value assets from potential future threats posed by advanced quantum computers.

According to the network's announcement, the rollout will be implemented in phases. Quantum-safe vaults for smart contracts are targeted for deployment on the mainnet later this year. Native account authentication using the new MLDSA65 signature scheme is planned for testnet by the end of 2026, with a mainnet launch targeted for the first quarter of 2027. The upgrade will be optional, following a model similar to previous features like zkLogin and passkeys, meaning existing accounts and applications will continue to function without modification.

The initiative addresses a specific vulnerability in blockchain systems known as "harvest-now, decrypt-later" attacks. Unlike traditional systems where public keys often remain hidden, blockchain accounts expose public keys on-chain the moment a transaction occurs. This allows potential attackers to archive these keys...