CalTrumpet writes: "Our research group recently spoke at Black Hat USA on the topic of Cloud Computing Security. One of the interesting outcomes of our research was the discovery that the combination of virtualization technologies and public system images results in a problem for random number generation on guest operating systems. This is especially true for Linux, since it's PRNG uses only a small set of entropy gathering events and virtual Linux images often generate SSH host keys within seconds of their initial boot. The slides themselves are available here"
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