“Enabling two-factor authentication (2FA) to boost security for your important accounts is becoming a lot more common these days. However you might be surprised to learn that you can do the same with your Raspberry Pi. You can enable 2FA on Raspberry Pi, and afterwards you’ll be challenged for a verification code when you access it remotely via Secure Shell (SSH).
Accessing your Raspberry Pi via SSH
A lot of people use a Raspberry Pi at home as a file, or media, server. This is has become rather common with the launch of Raspberry Pi 4, which has both USB 3 and Gigabit Ethernet. However, when you’re setting up this sort of server you often want to run it “headless”; without a monitor, keyboard, or mouse. This is especially true if you intend tuck your Raspberry Pi away behind your television, or somewhere else out of the way. In any case, it means that you are going to need to enable Secure Shell (SSH) for remote access.
However, it’s also pretty common to set up your server so that you can access your files when you’re away from home, making your Raspberry Pi accessible from the Internet.
Most of us aren’t going to be out of the house much for a while yet, but if you’re taking the time right now to build a file server, you might want to think about adding some extra security. Especially if you intend to make the server accessible from the Internet, you probably want to enable two-factor authentication (2FA) using Time-based One-Time Password (TOTP).”