(Secure Shell) a program used for authentication and secure communication.

(Secure Shell) A suite of applications offering secure equivalents to telnet, rlogin, and FTP. The standard versions of these applications transmit unencrypted passwords across the network or internet, leaving systems that use these unsecured applications vulnerable to intrusion. The SSH equivalents - SSH, SCP, and SFTP - encrypt all traffic (including passwords) to effectively eliminate eavesdropping, connection hijacking, and other network-level attacks.