I was reading up on passwords recently; here are some articles I found interesting.

• https://en.wikipedia.org/wiki/Password_strength
• https://en.wikipedia.org/wiki/Diceware
• http://world.std.com/~reinhold/diceware.html
• https://www.ece.cmu.edu/~lbauer/papers/2012/soups2012-passphrases.pdf
• https://en.wikipedia.org/wiki/Hashcat
• https://blog.agilebits.com/2013/04/16/1password-hashcat-strong-master-passwords
• https://pthree.org/2011/03/07/strong-passwords-need-entropy