http://www.openssh.com/. "OpenSSH is a FREE version of the SSH/SecSH protocol suite of network connectivity tools that increasing
numbers of people on the Internet are coming to rely on. Many users of telnet, rlogin, ftp, and other such programs
might not realize that their password is transmitted across the Internet unencrypted, but it is. OpenSSH encrypts
all traffic (including passwords) to effectively eliminate eavesdropping, connection hijacking, and other
network-level attacks. Additionally, OpenSSH provides a myriad of secure tunnelling capabilities, as well as a
variety of authentication methods."
February 17, 2001