SSH

SSH (Secure Shell), sometimes referred to as Secure Socket Shell, was originally developed as a Unix-based command interface that enables a user to securely access data from a remote computer. It is frequently used by network administrators to access web servers from a remote location. SSH is essentially a suite of three different utilities: SSH, Slogin and SCP (Secure Copy Protocol). These are all secure versions of the older Unix utilities: Rlogin, RSH (Remote Shell) and RCP (Remote Copy Protocol). SSH commands provide encryption and security in many different ways. In one instance, both ends of the client/server connection are authenticated by way of a digital certificate. The passwords are then protected by an encryption algorithm. SSH uses public key cryptography for the both the connection and authentication process. Some of the encryption algorithms it uses include DES, Blowfish and IDEA. SSH2 is the most recent version of this protocol and has been proposed as a standard by the IETF (Internet Engineering Task Force).