Chaos in Cloudflare’s Lisbon office: securing the Internet with wave motion

This post details the integration of a new physical entropy source, a 'wall of entropy' composed of 50 wave machines, into Cloudflare's LavaRand system. It describes the artistic and engineering challenges in creating custom wave machines capable of 24/7 operation, the specific components and fluid used, and the process of capturing images of the chaotic wave motion to generate random bytes. This new source of entropy complements existing sources like lava lamps, suspended rainbows, and chaotic pendulums, contributing to the cryptographic security of Cloudflare's global infrastructure and services like Cloudflare Workers and the drand API.