Lava Lamp Encryption Chris Coyier

November 27, 2020

From 2017, Joshua Liebow-Feeser on the Cloudflare Blog, about using the randomness of Lava Lamps for crypto randomization:

The flow of the “lava” in a lava lamp is very unpredictable, and so the entropy in those lamps is incredibly high. Even if we conservatively assume that the camera has a resolution of 100×100 pixels (of course it’s actually much higher) and that an attacker can guess the value of any pixel of that image to within one bit of precision (e.g., they know that a particular pixel has a red value of either 123 or 124, but they aren’t sure which it is), then the total amount of entropy produced by the image is 100x100x3 = 30,000 bits (the x3 is because each pixel comprises three values – a red, a green, and a blue channel). This is orders of magnitude more entropy than we need.

Cool.

(via Garbage Day)

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