What Are Passphrases?
A passphrase is a password that is lengthier than your typical password. They are easier to remember, and are tough to crack for a hacker. Passwords typically range from 8-16 characters in length, but passphrases can be as long as 100 characters or even more.
How Are Passphrases Generated?
Passphrases are generated by combining words from a dictionary called diceware. Diceware is list of words where each word corresponds with a specific and unique number. This number represents the 6 dice you have "roll" to get that word. For example, in the english diceware list, 424242 corresponds with the word mite. When the passphrase is generated, multiple digital dice are rolled to generate the passphrase. For more information about diceware, check out Wikipedia