Secure Shell

Secure Shell, or SSH, is a cryptographic network protocol that lets a user log into and run commands on a remote computer over an unsecured network while encrypting the entire session. Finnish researcher Tatu Ylonen created SSH in 1995 at the Helsinki University of Technology after a password-sniffing attack on his university's network, releasing it as a safer replacement for the older, unencrypted Telnet and rlogin tools. SSH became the standard method system administrators use to manage remote servers securely, and it is also commonly used to tunnel other kinds of network traffic through an encrypted connection.