ELI5? This is a at-least a 3rd-grade reading level and I mean at-least.
I've looked into Kerberos before. Who hasn't looked into Kerberos is the IT department at my day job. You can walk up to an open Ethernet jack, declare yourself root and access anyone's NFS.
Don't worry. All we make is security processors, the things that do the bulk encryption for the internet. No problem. Leave that source code flapping in the wind.