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What to start from

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If you have no idea how long the password is and what characters it may contain, just run the dictionary-based attack first. If it fails, try brute-force with the following options (character set and password length range):

Charset
Length
Passwords
Time (approx.)




All printable
1..6
742,912,032,768
14 hours
Digits, small/capital, space
7
3,938,980,724,736
3 days
Digits, small letters, space
8
3,512,479,514,624
3 days
Digits, capital letters, space
8
3,512,479,514,624
3 days
Digits
9..11
1,110,999,957,504
1 day
Small letters, space
9
7,625,596,993,536
6 days
Capital letters, space
9
7,625,596,993,536
6 days


The third column shows the total number of possible password combinations (with the given charset and password length); and the last column shows the maximum time required for recovery of the password, assuming that the speed is 15,000,000 passwords per second (the performance of a computer with Pentium 4 3GHz CPU on ZIP archives with three or more files using traditional encryption, and at least one is inflated).

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