Passphrase quality and lifespan

A secure network passphrase greatly enhances network security, so it is important to select an effective passphrase. In general, increasing length, complexity and randomness all improve the quality of a passphrase. Wi Fi Alliance recommends that a passphrase is at least eight characters long, and includes a mixture of upper and lower case letters and symbols. A passphrase should not contain a word found in a dictionary and should not include personal information (identification number, name, address, etc).