SSH

SSH, the Secure Shell Protocol, is a cryptographic network protocol for operating network services securely over an unsecured network, most commonly used for remote login and command-line execution on a distant machine. Finnish researcher Tatu Ylonen created the first version in 1995 after a password-sniffing attack on his university network, explicitly to replace insecure predecessors such as Telnet and rlogin that sent credentials in plain text. SSH's public-key authentication and encrypted channel became the standard way system administrators and developers reach remote servers, and it now also carries file transfer and port-forwarding traffic. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/