Today's xkcd highlights what might be one of the biggest security mistakes of our digital age: using passwords over passphrases. The comic does a great job of illustrating it. I've mentioned before that I use 1Password to store over 400 unique, random passwords. But how do I unlock 1Password? A passphrase that is long. Very long. Sadly being an active 1Password user I can highlight that many websites fail if you use passwords that are greater than 20 characters, much less a 40 or 50 character passphrase.