Why the password "this is fun" is 10 times more secure than "J4fS!2" - 87% Muscle, 100% Awesome

Why the password "this is fun" is 10 times more secure than "J4fS!2" - 87% Muscle, 100% Awesome: Security companies and IT people constantly tells us that we should use complex and difficult passwords. This is bad advice, because you can actually make usable, easy to remember and highly secure passwords. In fact, usable passwords are often far better than complex ones.