Authentication
When you start to create an interface adapted for illiteracy, you need to take normal routines that you do several times every day and reinvent it, giving them a better understanding and simplicity.
One of these daily routines is introducing a password. Instead of a password, they can remember a story with 4 animals, and the iconography of the animals in convention with their photo, the software is able to give to the user the security they need to use the system.