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SSH

Secure Shell (SSH) is a cryptographic network protocol for secure remote login, command execution, and file transfers. It is an indispensable tool for Linux, cloud computing, DevOps, and server administration, ensuring encrypted communication over unsecured networks.

See also: SSH Fundamentals: Secure Remote Access and Encryption Explained

Installation

• Windows: Install OpenSSH server via PowerShell (Admin): Add-WindowsCapability -Online -Name OpenSSH.Server~~~~0.0.1.0
• Linux: sudo apt install openssh-server (Debian/Ubuntu)

Configuration

• Windows (WSL):
  • Administrator accounts: All keys must go to: C:\ProgramData\ssh\administrators_authorized_keys (Windows OpenSSH ignores .ssh\authorized_keys for admin accounts)
  • Non-admin accounts: Use C:\Users\<user>\.ssh\authorized_keys
• Linux: Keys go to ~/.ssh/authorized_keys

Key Management

• Generate keys: ssh-keygen -t ed25519
• Distribute public keys to authorized_keys files on target servers
• Always use key-based authentication instead of passwords

Security

• Disable root login (PermitRootLogin no in sshd_config)
• Ensure all data transmitted is encrypted to prevent interception

References

• SSH Fundamentals: Secure Remote Access and Encryption Explained