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Three requirements for One Time Pads are:

  1.  Truly Random Key
  2.  Key as long as the message
  3.  Key is never used again

Assuming the three part computer system I described above (for operational security) the only problem is the first.  Turns out it's only possible to derive an algorithm capable of computing a pseudo-random number, at some point every algorithm cycles back to the beginning. Thus, any practical implementation is not mathematically 'complete' but it doesn't really matter.  Practical systems use a pseudo-random seed value - say the current barometric pressure divided by the current temperature times the second through ninth numbers in the mantissa of the current time - fed into a Good Enough pseudo-random number generator for the key.  

She believed in nothing; only her skepticism kept her from being an atheist. -- Jean-Paul Sartre
by ATinNM on Sat Aug 17th, 2013 at 11:27:16 AM EST
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