Everything about Lavarand totally explained
Lavarand was
Silicon Graphics' name for its
random number generator that worked by taking pictures of the patterns made by the floating material in
lava lamps, extracting random data from the pictures, and using the result to seed a
pseudo-random number generator.
It is covered under, titled "Method for seeding a pseudo-random number generator with a cryptographic hash of a digitization of a chaotic system."
For a time, there was a web site at
http://lavarand.sgi.com/ demonstrating the technique, but that's now defunct.
Landon Curt Noll, one of the originators, went on to help develop
LavaRnd, which doesn't use lava lamps. Despite the short life of lavarand.sgi.com, it's often cited as an example of an online random number source.
Further Information
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