What is SSH SSH (Secure SHell) is a network protocol which provides a replacement for insecure remote login and command execution facilities, such as telnet, rlogin and rsh. SSH encrypts traffic in both directions, preventing traffic sniffing and password theft. SSH also offers several additional useful features: Compression: traffic may be optionally compressed at the stream level. Public key authentication: optionally replacing password authentication. Authentication of the server: making man-in-the-middle attack more difficult Port forwarding: arbitrary TCP sessions can be forwarded over an SSH connection.

X11 forwarding: SSH can forward your X11 sessions too. File transfer: the SSH protocol family includes two file transfer protocols. 2.2 History SSH was created by Tatu Yl¨nen in 1995 and was at first released under an open-source license. Later versions were to bear increasing restrictive licenses, though they generally remained free for non-commercial use. He went on to form SSH Communications security which sells commercial SSH implementations to this day. The earlier versions of his code implement what is now referred to as SSH protocol v.1

Download SSH tips, tricks & protocol tutorial pdf