Password1 is a terrible password, but how can I remember different secure passwords for each login? Use a password manager. Dr Mike Pound explains how they work. How to Choose a Password: https://www.youtube.com/watch?v=3NjQ9b3pgIg Password Cracking on a 4x Titan X Beast: https://www.youtube.com/watch?v=7U-RbOKanYs Securing Stream Ciphers (HMAC): https://www.youtube.com/watch?v=wlSG3pEiQdc https://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: https://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com/