David Wong is a cofounder of zkSecurity, the author of the book Real-World Cryptography, a research advisor at Archetype, and the host of the Two and a Half Coins podcast. He's an ex Cryptography Architect at O(1) Labs (where he worked on the Mina cryptocurrency), prior to that he was the security lead for the Diem (formally known as Libra) cryptocurrency at Novi, Facebook. And before that a security consultant at the Cryptography Services practice of NCC Group. During his career, David has taken part in several publicly funded open source audits such as OpenSSL and Let's Encrypt. He has spoken at various conferences including Black Hat and DEF CON and has taught a recurring cryptography course at Black Hat. He has contributed to standards like TLS 1.3 and the Noise Protocol Framework. He has found vulnerabilities in many systems including CVE-2016-3959 in the Golang standard library, CVE-2018-12404, CVE-2018-19608, CVE-2018-16868, CVE-2018-16869, and CVE-2018-16870 in various TLS libraries. Among others, he is the author of the Disco protocol (www.discocrypto.com and www.embeddeddisco.com) and the Decentralized Application Security Project for smart contracts (www.dasp.co). His research includes cache attacks on RSA (http://cat.eyalro.net/), protocol based on QUIC (https://eprint.iacr.org/2019/028), timing attacks on ECDSA (https://eprint.iacr.org/2015/839), or backdoors in Diffie-Hellman (https://eprint.iacr.org/2016/644). You can see read about him these days on his blog at www.cryptologie.net