| Rev | Author | # | Line |
|---|---|---|---|
| 22 | LawrenceDoliveiro | 1 | __Use pwgen(1)__ |
| 2 | |||
| 3 | But if that’s too easy for you, here are some more complicated ways of doing it: | ||
| 4 | |||
| 19 | JohnMcPherson | 5 | !!PerryLorier's preferred and highly recommended way of choosing passwords |
| 17 | CraigBox | 6 | |
| 7 | <pre> | ||
| 20 | GeorgePollard | 8 | cat /dev/urandom | tr -dc ' -~~' | fold -w 20 | head -n 1 |
| 17 | CraigBox | 9 | </pre> |
| 10 | |||
| 11 | His new password is <tt>_]}e9pgU5-u6_hr~[KF|*</tt>. | ||
| 12 | |||
| 13 | !What this does | ||
| 14 | |||
| 15 | /dev/urandom is an interface to the kernel's random number generator. If you cat it, you'll get (mostly) random characters. See random(4) for information. | ||
| 16 | |||
| 17 | tr(1) is a character translator. -d stands for 'delete characters in this set' and -c stands for 'compliment'. If you check ascii(7) you will see that space and tilde (~) are the outer limits of the 'typeable' ASCII character set. The translator stage will throw away anything lower than space or higher than tilde (all the high-bit ASCII character). | ||
| 18 | |||
| 19 | fold(1) wraps lines to a certain width. -w 20 wraps at 20 characters (the default is 80.) Mere mortals will probably want to set this to around 8. | ||
| 20 | |||
| 21 | head(1) (the opposite of tail(1)) returns the first lines of an input. head -1 returns only the first line. (use head -n 8 if you want some choices to pick from). | ||
| 22 | |||
| 23 | !But but but | ||
| 24 | |||
| 25 | If you're a real Unix nerd or are worried that using another process for ''cat(1)'' will only accelerate our path to the heat death of the universe, you can use | ||
| 26 | |||
| 27 | <pre> | ||
| 28 | < /dev/urandom tr -cd '~[:print:]' | head -c 20 ''# every time you waste a cat, god kills a kitten'' | ||
| 29 | </pre> | ||
| 30 | |||
| 31 | !Variants | ||
| 32 | |||
| 33 | AristotlePagaltzis prefers slightly less cryptic passwords that are longer instead, which results in | ||
| 34 | |||
| 35 | <verbatim> | ||
| 36 | #!/bin/sh | ||
| 37 | < /dev/urandom tr -cd '[:alnum:]$!@_:=-' | head -c "${1:-32}" | ||
| 38 | echo | ||
| 39 | </verbatim> | ||
| 40 | |||
| 41 | !!Other methods | ||
| 42 | |||
| 43 | Another popular method is to take the first letter of each word in a line from a song (eg ''I want to ride my bicycle'' -> <tt>iw2rmb</tt>) | ||
| 44 | |||
| 45 | Pick a password that sounds like an English word, and people are more likely to remember it. A good Java password generator can be found at http://www.multicians.org/thvv/gpw.html. | ||
| 46 | |||
| 21 | DouglasRoyds | 47 | If none of these methods are to your liking, you can always set your password to <tt>gandalf</tt>. This is highly original, and no one is likely to think of it. |
| 17 | CraigBox | 48 | |
| 49 | You might find more information on the SecurityNotes page. | ||
| 50 | |||
| 51 | ---- | ||
| 52 | CategorySecurity |
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