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Don't make it easy for intruders to gain access to your system. Select passphrases that are hard for others to guess, but easy for you to remember.
Passwords are single words, whereas passphrases are entire phrases or sentences. Passphrases are generally safer because they are much longer than passwords, making it more difficult for hackers to guess. Passphrases must still vary in uppercase and lowercase letters, numbers and punctuation marks.
The Security Office recommends changing your passphrase every 30 days. If your username and passphrase have been compromised, this can stop the unauthorized access to your accounts.
NOTE: It is important to require a startup passphrase when your computer turns on. Although automatic log-ins are convenient, it gives anyone easy access to your computer.