Lavarand
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Lavarand™ is Silicon Graphics' name for its method of generating truly random numbers by taking pictures of the patterns made by the floating material in lava lamps.
It is covered under U.S. Patent 5732138 , titled "Method for seeding a pseudo-random number generator with a cryptographic hash of a digitization of a chaotic system."
It was also a web site (http://lavarand.sgi.com/) demonstrating the technique, but that is now defunct. Landon Curt Noll, one of the originators, went on to develop the LavaRnd site, which does not use lava lamps.
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