Konstantinos C.

Crypto Lead in 3 blockchains: R3 Corda, Facebook's Libra (Diem), Mysten Lab's Sui. Secure software and cryptography auditor having identified some of the most impactful vulnerabilities in the space (Base64 malleability, Ed25519 api misuse in dozens of major wallets and crypto software, EdDSA RFC inconsistencies across libraries and HSM implementations, Proof of Solvency attacks in many notable crypto exchanges, lottery smart contract randomness issues, a16z's sealed-bid auction Ethereum contract, various key exchange attacks) Lead Contributor to multiple cryptographic libraries (Meta's Novi and WhatsApp, Corda blockchain, R3 confidential Conclave, Fastcrypto lib, Sui blockchain, Narwhal & Tusk, Bullshark, HashWires RangeProofs, Winterfell ZKP, DAPOL+, SMtree sparse trees etc) Implemented some of the fastest and popular algorithms for Timed Release Encryption, blockchain focused Post Quantum Signatures, STARK Zero Knowledge Proofs, Key Loss Protection, Liability Proofs, Sparse Trees, Batch Ed25519 verification, BLS aggregation for committees) 1st in Stackoverflow among Greek and Bay Area based engineers who joined SO after 2014.