see --help
-a 0 is dictionary attack and you need to provide a dictionary
-a 3 is mask attack (or "brute-force") and you need to provide a mask
upper = 26 chars, lower = 26 chars, digits = 10 chars => 26 + 26 + 10 = 62 chars
62 chars * 62 chars * 62 * 62 * 62 * 62 * 62 * 62 * 62 * 62 * 62 * 62 * 62 = 62 ^ 13 =
200,028,539,268,669,788,905,472 = infeasible ^ 2
if you think that 16 - 6 is much better, you are wrong again ! it's still infeasible because 62 ^ (16-6) = 62 ^ 10 =
839,299,365,868,340,224 (and still infeasible, just a little bit smaller number, but not significant and still not feasible
)
-a 0 is dictionary attack and you need to provide a dictionary
-a 3 is mask attack (or "brute-force") and you need to provide a mask
upper = 26 chars, lower = 26 chars, digits = 10 chars => 26 + 26 + 10 = 62 chars
62 chars * 62 chars * 62 * 62 * 62 * 62 * 62 * 62 * 62 * 62 * 62 * 62 * 62 = 62 ^ 13 =
200,028,539,268,669,788,905,472 = infeasible ^ 2
if you think that 16 - 6 is much better, you are wrong again ! it's still infeasible because 62 ^ (16-6) = 62 ^ 10 =
839,299,365,868,340,224 (and still infeasible, just a little bit smaller number, but not significant and still not feasible
)