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Passwords

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How to change a DICE password

Login to a DICE machine, open a terminal window (how to open a terminal window) and type passwd.

Password policy for DICE accounts

DICE passwords must currently:

  • be at least 8 characters long, and
  • be composed of a minimum of:
    • 3 character classes (for a password length of 8-12 characters)
    • 2 character classes (for a password length of 13-19 characters)

Passwords which are 20 characters or more have no character class constraints.

The four recognised character classes are:

  • lowercase letters
  • uppercase letters
  • digits
  • symbols (all non-alphanumeric characters, including space)

In addition, any new password must differ from the previous two passwords.

Any new password will also be checked against a large dictionary of known password/passphrases. Any password that matches an entry in this dictionary will be rejected.

These standards are enforced at password creation/update time by the School's Kerberos Key Distribution Centre (KDC).

Choosing a good password

A good password is something which is easy for you to remember, but difficult for someone else to guess. You should avoid commonly known words or phrases.

You should not write your password down or tell it to anyone.

You must not use your DICE password anywhere else.

See also Information Services' guidance on information security, including advice on passwords.

Last reviewed: 
02/09/2016

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