Too Long; Didn't Read
The Anatomy of A Strong Passphrase That Is Easy To Remember. A password is easier for a computer to guess (less entropy), and also is harder to remember. The key to a memorable passphrase is to take 4 or 5 random words, and use those words to create an image in your head. The more ridiculous the image, the easier it will be to remember, but picturing the image is what will cement in your mind for the long term. The chart below gives a rough idea of how long a given password will take to crack.