Cryptographic Randomness from Air Turbulence in Disk Drives

  title={Cryptographic Randomness from Air Turbulence in Disk Drives},
  author={Don Davis and Ross Ihaka and Philip Fenstermacher},
A computer disk drive's motor speed varies slightly but irregularly, principally because of air turbulence inside the disk's enclosure. The unpredictability of turbulence is well-understood mathematically; it reduces not to computational complexity, but to information losses. By timing disk accesses, a program can e ciently extract at least 100 independent, unbiased bits per minute, at no hardware cost. This paper has three parts: a mathematical argument tracing our RNG's randomness to a formal… CONTINUE READING
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