From: Alexander Klimov (alserkli@inbox.ru)
Date: Thu Jan 19 2006 - 12:35:57 EST
On Thu, 19 Jan 2006, Sulaiman, Wilmar wrote:
> I would like to know where they derived the number (6 and 8 characters).
The method is as follows: you define how long an attacker can try (T),
how many attempts he can make per time unit (A) and what is
the probability of breakin (P). If the whole keyspace is S then
A*T/S = P
and so
S = A*T/P
Next step is to determine how many bits of entropy (B) are in each
character and the length of the password can be calculated:
L = log(S)/B
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