kostas
LT / europe
Summary
👤
SeniorKostas Chalkias is a co-founder and Chief Cryptographer at Mysten Labs with over two decades of hands-on experience building cryptographic systems, blockchain security, and big-data platforms. Previously he led cryptography efforts at Meta (Diem/Novi/WhatsApp) and R3, contributing to projects like Winterfell ZKP, Sparse Merkle Trees, EdDSA aggregation and proof-of-solvency standards. He combines deep academic credentials and prolific research—50+ papers, multiple best-paper awards and eight US patents—with startup CTO experience shipping production-grade security and ML systems. Known for practical, high-performance protocols (fast ZK and signature work) and unusual side projects from timed-release encryption to graphical passwords, he blends offensive analysis with defensive engineering. Based in the Bay Area, he also founded Athens’ largest Big Data meetup and remains active in open-source prototyping and cross-disciplinary cryptography research.
13 years of coding experience
Github Skills (13)
messaging-api7
sdk7
python6
signal6
decrypt5
backup4
cryptography4
encryption4
security4
network3
p2p3
peer-to-peer2
communications2
Programming languages (3)
Github contributions (5)
wfn/torsearch
Jul 2013 - Feb 2016
Contributions:44 commits, 1 push in 2 years 8 months
wfn/avian-polyphony
Nov 2025 - Nov 2025
Contributions:3 PRs, 11 pushes, 3 branches in 2 days
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