Stronger password requirement

[angelamchoi]

At the moment, the password requirement is min. 6 characters long without any restrictions on uppercase, lowercase, numbers, or symbols. For example, a user's password could be 123456 and it would meet the requirement. To ensure all users have a secure password, could I increase the password requirement? I have implemented this before using Devise's custom password and would love to work on this issue. I've also attached an image of how long it takes a hacker to brute force a password.