How do i setup AES encryption

how it works i am not understanding , is it built in , is there any thing i need to do for , any extra step. it happen when i export automatically. or i need to give storage name ( .sav ) and ( .tmp ) . please tell

  1. Why would you need AES?
  2. AES is not safe as the code is client side and the password is therefore directly readable from the JavaScript
  3. No there is no out of the box way. You need to use JavaScript.

i have no idea thats why i am asking, thanks