Can someone point out a big flaw in my password management system? I have always felt kinda dumb for not using a PW manager but my system has worked for the last ~10+ years and I have never had any issues. I memorized a small function that takes the product name as input and spits out a password. it achieves the goal of having a unique pw for every service without having to write anything down (in software or on pape…
The issue is that your passwords have almost zero entropy in them. The only guard is that others don't know your secret function. Password crackers are already programmed to handle functional password composition. You might want to ask yourself why pw crackers are programmed that way.