cross-posted from: https://feddit.org/post/36134515
https://www.cloudflare.com/...
since the motion of fluids is notoriously hard to compute, this makes for a good source of randomness.
Cloudflare uses lava lamp as a source of randomness
12 days ago by gandalf_der_13te to c/til
random_character_a 16 points 11 days ago
Now everyone wants a wall of lava lamps
grue 27 points 11 days ago
Invented by SGI in 1996, so fully three decades ago now.
https://en.wikipedia.org/wiki/Lavarand
Also, even the open-source successor is so old that they released it on Sourceforge, of all places.
PixeIOrange 17 points 11 days ago
Fun fact: theres an app for the flipper zero that uses the ir receiver and a lighter to generate random numbers.
damnthefilibuster 7 points 11 days ago
Where can I get me one of those? Flipper zero, not lighter.
Varesti 13 points 11 days ago
path: 0 26104985 26105042 26105412, hotness: undefined, score: 13, children: 0
chaospatterns 4 points 11 days ago
IMO this is more PR than anything. The lava lamps are far away from the camera that the variance in pixel data from the lava lamps is low. Think about the percentage of pixels changing compared to the total camera space and the range of pixel data.
I've heard about pointing a camera at a black surface, then massively upping the gain which causes the camera to oversaturate the noise in the sensor measuring process to get random seed data.
damnthefilibuster 25 points 11 days ago
No the lava lamps were a real thing. But they aren’t used any more. They said they moved to post quantum crypto now, so they can’t rely on that tech any more.
But the lava lamp randomness was a real thing while it lasted.
gandalf_der_13te 22 points 11 days ago
yeah but even if only 1 pixel changes, if you take the hash value of the image data, you'll still get some entirely different numbers.
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I think they just wanted a wall of lavalamps.
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