On Mon, 10 Mar 2008 15:27:47 EDT erik quanstrom <[EMAIL PROTECTED]> wrote: > > > > > brushing off the factor of 2^60 is like brushing off the difference > > > in weight between a bunch of banannas and the moon. > > > > bunch of bananas = ~1kg > > mass of moon (weight of moon @ earth's sea level) = 7.3477^22 kg > > 2^60 = 1,152,921,504,606,846,976 = 1.15etc^18 > > > > Oh oh, you're off by 4 orders of magnitude, I think I hear collisions... > > that's cause it's 2^80 not 2^60. did i mistype?
Nonrecoverable read error rate for disks is typically 1 in 10^14. While >0.5 probability that two arbitrary blocks hash to the same SHA1 value is 1 in 2^80. That is roughly a factor of 10 Billion. So we are talking about a bunch of bananas and less than 1000 Chiquita cargo ships.
