[chord] How to infer the O(log N) in the Chord paper?

[ISO]

Hi,all
   I just have read the technical report on Chord, 
however, I am puzzled at the result of O(log N).
That is, at the page 8, saying "In this case, the 
load on a node may exceed the average by (at most)
an O(logN) factor with high probability (or in our 
case, based on standard hardness assumptions)." But
how can we infer the O(log N) factor based on the 
standard hardness assumptions?

   Can you give me some more detailed explanation?
Thanks!

Jie
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