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Given the following table:
| Types of characters (English) |
Number (k) |
| Lower-case alphabetic | 26 |
| Numeric and lower-case alphabetic | 36 |
| Upper and lower-case alphabetic | 52 |
| Numeric, lower-case alphabetic, with symbols and punctuation | 68 |
| All displayable characters | 94 |
- How long does it take to crack an 8-character UNIX password?
Please justify your answer.
Note that you may assume anything.
(i.e. dictionary attack, brute force attack, speed and number of machines using)
- From your calculation in exercise 1, what do you think is the minimal length of a password to be considered secure enough?