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ALS 2000 Abstract
SSH Port Forwarding
Giles Orr, and Jacob Wyatt, Georgia College & State University
Abstract
Secure Shell (a secure replacement for telnet/rsh) allows the securing of normally insecure services such as FTP, POP,
SMTP, and VNC. We will discuss basic installation of SSH, including several examples of port forwarding, and you
will learn how to apply this excellent security tool for your own purposes.
SSH stands for "Secure SHell." SSH is a replacement for telnet, rsh, and rlogin, to allow secure shell access to remote
machines over an untrusted network. Telnet was designed at a time when the Internet consisted of a relatively small
number of universities, and no one had ever heard of a packet sniffer. Packet sniffers such as sniffit and tcpdump are
now relatively common - they have some highly practical uses, but obviously can also be used to collect passwords of
those using unencrypted connections on a local network. Even if the password handshaking is encrypted, quite a bit of
personal information can be collected watching an unencrypted transaction after the passwords. SSH packets looks like
garbage to a packet sniffer.
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