3 ms·
What max length? Once a password reaches 128 bits of entropy the key space is unfathomably large. You could have a password of length 1 with 10^100 possible val
by tmountain 5y ago
What max length? Once a password reaches 128 bits of entropy the key space is unfathomably large. You could have a password of length 1 with 10^100 possible values, and it could take a VERY long time to crack. In short, it has nothing to do with length, it has to do with bits of entropy, and there are still very real limits to what even the most powerful computers can brute force. Several years back, it was stated by Peerio that an 81-bit password would cost a billion dollars to crack. It becomes less feasible and more expensive from there.
- bluGill 5y ago8 character, upper lower case, ten numbers, and about fifteen special symbols. About 6 bits per character. Most limits are 8 characters, so around 40 bits. More or less depending on the exact rules used. That assumes true random passwords, most attackers can make some educated guesses and cut the problem space, but that isn't a true brute force.