title: AES128 vs AES256 using bruteforce
body: <p>I came across this:</p>
  
  <p><img src="https://i.stack.imgur.com/9jeNJ.jpg" alt="Key combinations versus Key size"></p>
  
  <p>I don't understand how AES128 is stronger than AES256 in a brute force attack, or how AES256 allows for more combinations than AES128.</p>
  
  <p>These are my simplified premises - assuming I have 100 unique characters on my keyboard, and my ideal password length is 10 characters - there would be 100^10 (or 1x10^20) combinations for brute force attack to decry-pt a given cipher text.</p>
  
  <p>In that case, whether or not AES128 or AES256 is applied doesn't make a difference - please correct me.</p>