LavaRand: network security with lava lamps (Cloudflare)

As some of you may know, there's a wall of lava lamps in the lobby of our San Francisco office that we use for cryptography. In this post, we’re going to explore how that works in technical detail. (…)

LavaRand is a system that provides an additional entropy source to our production machines. (…) A video feed of this wall is used to generate entropy that is made available to our production fleet. (…)

https://blog.cloudflare.com/lavarand-in-production-the-nitty-gritty-technical-details/