Choosing good passwords in Mac OS X

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Mac OS X is designed to give you a safe and secure computing environment, often by the use of passwords. One of the best things you can do to keep your information and computer secure is to use good, hard-to-guess passwords.

These suggestions can help you create a unique, secure password for all of your online accounts, not just your Apple computer and AppleID.

http://support.apple.com/en-nz/HT201579