Zero Knowledge ZK in Sui & zkAt with Kostas Kryptos
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Jun 25, 2025 
Kostas Kryptos from Mysten Labs and Tarun Chitra, a seed investor in SWE, dive into groundbreaking ZK innovations. Kostas unveils zkLogin and zkAt, an updatable access control project harnessing unique approaches to trusted setups. They discuss Sui's ambition to go quantum-ready through STARKs while transitioning EdDSA accounts. The conversation also uncovers the application of ZK technology in the Greek stock market and the evolution of cryptographic account management, spotlighting dynamic access controls and the future of decentralized finance.
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Quantum-Ready Account Transition
- Sui can upgrade existing EdDSA accounts to post-quantum security by replacing elliptic curve signatures with STARK-based signatures.
- This transition keeps the same user addresses while relying on zero knowledge proofs to verify key derivation in a quantum-resistant manner.
ZK Login Proof Usage
- ZK Login requires generating a zero knowledge proof validating that the public key used matches the one authorized via OAuth providers like Google.
- Proof generation happens once per session, but verification occurs on every blockchain transaction, making it highly utilized in Sui.
Simplify Login with Multi-OAuth
- Remove user friction by allowing login through familiar OAuth methods like Google and Facebook integrated with blockchain wallets.
- Combine multiple authenticators, requiring multiple OAuth providers to collude to compromise an account, enhancing security.