SSH Mastery: OpenSSH, PuTTY, Tunnels and Keys (IT Mastery)

Focused on mastering the Secure Shell (SSH) protocol, primarily using OpenSSH and the Windows client PuTTY. The book is designed to guide both system administrators and general users beyond basic command-line usage, covering advanced topics such as encryption fundamentals, server and client configuration (including specific files like sshd_config and ssh_config), and the importance of user and host keys over password authentication. Crucially, it dedicates significant attention to practical security measures, including host key verification, setting up port forwarding (local, remote, and dynamic), utilizing SSH agents, and implementing an OpenSSH Certificate Authority (CA) to simplify key management in larger environments. Finally, the author urges readers to support the OpenSSH and PuTTY projects and emphasizes the need to eliminate passwords for improved security.

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