OpenSSH#

OpenSSH (Open Secure Shell) is a suite of open source tools for establishing secure network connections between machines, primarily via the SSH (Secure Shell) protocol. Originally developed by the OpenBSD team, OpenSSH is now widely used on Unix/Linux, macOS and Windows systems for remote administration and secure file transfer.

Main objective#

OpenSSH allows you to administer and communicate with remote systems in a confidential, authenticated and fully encrypted manner, replacing unsecured protocols such as Telnet, rlogin, or FTP.

OpenSSH components#

sshd SSH server service that accepts and manages incoming connections.
ssh Client that enables a secure connection to be established to a remote host.
scp (Secure copy) Secure file transfer.
sftp Secure FTP protocol based on SSH.
ssh-keygen Generating and managing SSH key pairs.
ssh-agent et ssh-add Private key management in memory to avoid re-entering passwords.
sshd_config / ssh_config Server and client configuration files.