![]() ![]() ![]() beginning by the most frequently chosen passwords), will hit the right password after an average of 2 n-1 trials. The notion of entropy can be refined a bit in case the password selection process is not uniform: we say that a password has n bits of entropy if an attacker trying a list of potential passwords, in decreasing order of probability (i.e. For instance, a password with "25 bits of entropy" is such that it has been chosen randomly (and uniformly) among a list of 2 25 possible passwords. a target server, or the client itself) for each guess.Ī password "strength" can be measured by its entropy, which is a way of stating how many values that password could have assumed. On the other hand, an online attack is one where the attacker must interact with an "honest" system (one which knows the correct password, e.g. For instance, the attacker got a copy of the hash of a password. An offline attack is one such that the attacker got enough data to "test" passwords on his own machines, at a rate which is limited only by whatever computational power he can muster. I do not know if your question is about dictionary attacks in general, or dictionary attacks in the case of a WiFi network with password protection.įor the general question of dictionary attacks: there are two kinds of dictionary attacks, the online attacks and the offline attacks. ![]()
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