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Science Forum Index » Cryptography Forum » Help on Different Cryptanalysis...
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| Pablo... |
 Posted: Thu May 08, 2008 3:01 am |
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Guest
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Hi,
Actual I’m studying the Different Cryptanalysis with Bihams and
Shamirs document "Different Cryptanalysis of DES-like cryptosystems",
but there's something I can’t understand yet: how to calculate the
amount of good pairs needed to found the round key. I know that there
is a relation between that amount and the signal to noise rate, but I
don’t know how to determine that relationship.
And here comes my second question: how can I calculate the signal to
noise rate? I found a formula where the S/N depend on the “probability
of the differential characteristic”, “the number of key bit that we
count on” and “the level of identification of wrong pairs that can be
discarded before the counting”. I know the probability of the
differential characteristic and the number of key bits that we count
in an attack, but how can I determine the “level of identification of
wrong pairs that can be discarded before the counting”?
Thanks
Pablo |
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