SSH Tools (OpenSSH, PuTTY, WinSCP, SSH-Audit)

#The Power-User's Toolkit#link

Now that we understand the architecture and hardening of SSH, we need the tools to implement and audit it. While `ssh` in the terminal is the standard, a professional security engineer uses a suite of tools to verify that their hardening is actually working.

OpenSSH: The Industry Standard

OpenSSH is the default implementation for almost all Linux/Unix systems. It's not just a client; it's a full suite including `ssh-keygen` (for keys), `ssh-copy-id` (for deployment), and `sshd` (the daemon). Mastery of the `~/.ssh/config` file is the difference between a manual admin and an efficient one.

# Example ~/.ssh/config
Host prod-web
    HostName 192.168.1.50
    User admin
    Port 2222
    IdentityFile ~/.ssh/id_ed25519
    ProxyJump jump-host

GUI Tools: PuTTY, WinSCP, and Termius

For Windows users, PuTTY was the long-time king. It provides a GUI for managing sessions and keys (`.ppk` format). WinSCP is the standard for those who prefer a 'Drag and Drop' SFTP interface over the command line. However, most of these have been superseded by the native OpenSSH client now built into Windows 10/11.

ssh-audit: The Penetration Tester's Choice

How do you know if your `sshd_config` is actually secure? You use `ssh-audit`. This tool connects to the server and analyzes the Kex, Ciphers, and MACs. It flags everything that is 'Weak', 'Deprecated', or 'Vulnerable' based on current security standards.

• ▪Use `ssh-audit` as part of your monthly compliance check
• ▪Standardize on `~/.ssh/config` for all team members
• ▪Use Ed25519 keys across all tools
• ▪Rotate host keys if a server is ever compromised