Because we offering the ability to host your own DocSort server we need some security layers and one of the best options is 2FA (Two factor authentification). It's simple to setup, doesn't need any technical knowledge of the user and is fast to use at login. As developer it's easy to implement too (as example this library) and can be a great security layer.

I'll watch out for more security layers that can be added (like awnser some questions) to reach maximum security. I think for a program like DocSort this is extremly necessary to protect your documents from others.