Telnet and the r-utilities are often used to log onto another computer over a network, to execute commands on a remote machine, and to move files from one machine to another. While SSH2 is backwards compatible to SSH1 servers via emulation, some features and utilities do not work unless the server is also running SSH2. X11 tunneling, SCP2 and SFTP will NOT work unless the server is also running SSH2. The ITSO provides an non-commercially licensed Windows SSH2 client . Unix SSH2 client and server installation guide Features Strong authentication.
All communications are automatically and transparently encrypted.
Encryption is started before authentication, and no passwords or other information is transmitted in the clear. Encryption is also used to protect against spoofed packets. Secure X11 sessions. Never trusts the network. Minimal trust on the remote side of the connection.