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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Kostas' Crypto Journey
- Kostas Kryptos shares his journey into cryptography after being hacked in 2003, leading to his deep work in zero knowledge proofs and blockchain.
- His experience ranges from working with early Bitcoin developers to leading cryptography at Facebook's Libra project and now contributing to Sui.
Post-Quantum Upgrade Scope
- Post-quantum security requires upgrading not just signatures but also accumulators, hash functions, and communication protocols like TLS.
- Sui aims to transition comprehensively, leveraging zero knowledge proofs like STARKs and Ligero for quantum resistance.
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.