Frequently Asked Questions |
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UBC Mathematics: MathNet FAQ [Good passwords]
UBC Mathematics: MathNet FAQ [Good passwords]
Question: What is a good password?
Author: Joseph Tam
Date: Aug. 24, 2012
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Passwords provides a line of defense against unauthorized access to
your private data. A poor password places all your information in
jeopardy, and undermines the security of our network as a whole. Please
choose, and use, a secure password that is not prone to trial and error
guessing, and is computationally hard to find by searching all possibly
passwords (i.e. brute forcing).
Secure password guidelines
- Length: your password must be 8 characters or longer.
Longer is better.
- Complexity: your password must have a least one character
that is neither a letter (A-Z,a-z), nor a digit (0-9).
- Wordlist/dictionary: do not use passwords that
can be found in any dictionary or wordlist, of any language.
Even jargons.
- Personal identifiers: do not use SINs, telephone numbers,
dates, friends/family/pets names, etc.
- Simple transformations: do not reverse ("password" -> "drowssap"),
append/prepend digits or single characters ("secret" -> "secret!" or "secret5"),
replicate ("blah" -> "blahblah"), or do simple substitutions
(O->@, o->0, l->1, E->3, e.g. "password" ->
"p@ssw0rd) to any of the above. Not all people with bad
intentions are idiots -- they know these tricks too!
- Never, never reveal your password to anyone, especially
if it asked of you via Email, or requested on a web
site that is unknown to you and/or outside of our domain
(math.ubc.ca)
Some techniques on choosing passwords:
- Use a passphrase: "I won't eat dirt!"
- Nonsense word: "!grianDor@"
- Use the first/second/etc. letter from each word in a passphrase:
"Tmd,u2cof" (To make dough, use two cups of flour)
- Combine words in a non-obvious ways: "$mix%baseball#"
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