Web Reference: You don’t need to know what two-factor authentication is and how it works. Originally authored by Nicole Mikołajczyk. 2. Installing and configuring required packages. 3. Configuring authentication. 4. Adding the secret to Google Authenticator. 5. Getting help. Jul 16, 2025 · In this article, I will show you how to set up and configure SSH for two-factor authentication under RedHat-based and Debian-based Linux distributions such as Fedora, CentOS Stream, Rocky Linux, and AlmaLinux, Ubuntu, Debian, and Mint. Feb 25, 2026 · In this comprehensive guide, we’ll walk you through setting up Time-Based One-Time Password (TOTP) 2FA for SSH using the Google Authenticator PAM (Pluggable Authentication Module) module.
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