This Raspberry Pi project created by maker Angainor shows you how to build a two-factor authentication system using a Raspberry Pi Pico ...

There’s a serial modem and a USB to serial adapter involved, and a PPP daemon running on the Pi clone answers the incoming call, negotiates authentication, and does the NAT.

However, convenient and free two-factor authentication can add a high level of security to your Raspberry Pi or other Linux-based projects.

Here's how it works. Once the PoisonTap software is installed, the Raspberry Pi device becomes a miniature Linux computer that presents itself as an Ethernet network.