About your IU passphrase
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Passwords and passphrases
Passwords are short sequences of letters, numbers, and symbols that you enter to verify your identity to a system in order to access secure data or other resources. Passphrases operate on the same principle and are used in the same way, but differ from traditional passwords in two aspects:
- Passphrases are generally longer than passwords. While passwords can frequently be as short as six or even four characters, passphrases have larger minimum lengths and, in practice, typical passphrases might be 20 or 30 characters long or longer. This greater length provides more powerful security; it is far more difficult for a cracker to break a 25-character passphrase than an eight-character password.
- The rules for valid passphrases differ from those for passwords. Systems that use shorter passwords often disallow actual words or names, which are notoriously insecure; instead, your password is usually an apparently random sequence of characters. The greater length of passphrases, by contrast, allows you to create an easily memorizable phrase rather than a cryptic series of letters, numbers, and symbols.
Passphrases at Indiana University
To keep your passphrase secure, you should change it every six months.
Your passphrase must:
- Contain at least 15 characters (127 characters is the maximum allowed).
- Use at least four unique characters; letters, numbers, and
symbols are allowed (except for the invalid symbols
Network ID passphrases are case-sensitive: The lowercase
cis different from the uppercase
C. Make sure that the
Caps Lockkey is not on when you create your passphrase, unless you intend to enter all uppercase letters.
- Use at least four words, with "word" defined as two or more
Words must be separated by one or more spaces or by valid symbols other than the underscore (
_); therefore, you can't use numbers, letters, underscores, or any invalid symbols to separate "words"; for example:
- This passphrase contains four "words", with a space, a dollar
$), and a dash (
-) functioning as separators, and therefore meets the requirements for a valid passphrase:
- This passphrase contains only three "words" separated by spaces,
because the underscore and numbers do not function as separators. It
therefore does not meet the requirements for a valid
HOAGY_car Michael plays123stardust
- This passphrase contains four "words", with a space, a dollar sign (
Your passphrase must not:
- Contain your name or Network ID username.
- Use any of these invalid symbols:
- The "at" sign (
- The hash tag or number sign (
- The greater-than (
>) or less-than (
- The double quotation mark (
- The "at" sign (
- Be a common phrase; for example:
to be or not to be april showers bring may flowers
- Be based on a predictable pattern, such as the alphabet or the layout of a standard keyboard.
This is document acpu in the Knowledge Base.
Last modified on 2015-08-25.
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