Pay particular attention to the difference between using only lowercase characters and using all possible characters (uppercase, lowercase, and special characters – like @#$%^&*). Adding just one capital letter and one asterisk would change the processing time for an 8 character password from 2.4 days to 2.1 centuries.

Password Length All Characters Only Lowercase
3 characters

4 characters
5 characters
6 characters
7 characters
8 characters
9 characters

10 characters
11 characters
12 characters
13 characters
14 characters

0.86 seconds

1.36 minutes
2.15 hours
8.51 days
2.21 years
2.10 centuries
20 millennia

1,899 millennia
180,365 millennia
17,184,705 millennia
1,627,797,068 millennia
154,640,721,434 millennia

0.02 seconds

.046 seconds
11.9 seconds
5.15 minutes
2.23 hours
2.42 days
2.07 months

4.48 years
1.16 centuries
3.03 millennia
78.7 millennia
2,046 millennia

How I’d Hack Your Weak Passwords – One Man’s Blog

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