The Colleague (Datatel) system uses your Norse Key to login and you are required to change your password every 180 days. You can change your Norse Key by visiting norsekey.luther.edu
Choose hard-to-guess passwords and make them long (10-24 characters). Passwords cannot contain spaces or these characters \ * : , < > Do not use a word you would find in a dictionary (in any language or jargon). Do not use a name (spouse, parent, child, pet, etc) or any variation of your personal or account name. Do not use accessible information such as phone number, license plate, or social security. Do not use a birthday or simple pattern.
Use a mixture of upper and lower case letters as well as digits or punctuation. Make sure a new password is unrelated to any previous password.
These principles are partially enforced by the system, but only partly so. Vigilance on your part will make the system much more secure.