Ext2: Secure Remote ConnectionsJul 13, 1999, 22:57 (0 Talkback[s])
(Other stories by Kevin Fenzi)
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"One of the great things about linux is that you can connect to your machine remotely and administrate it, use it, etc. Of course tools to do that have existed as long as unix itself has existed. Telnet, rlogin, rsh, rexec, X all do a great job of letting you access your machine and get things done."
"Those tools worked great until the advent of the first packet sniffer. Packet sniffers are simple programs that run and decode network traffic. Typically they look for particular bytes in the network stream like 'Password:' or 'authentication' or 'login' and then grab all the bytes after that string: Your password or authentication token. With large networks and vast numbers of machines out there today, there is no telling where a sniffer could be running."
"There are several ways to prevent this from ruining your day (and letting a cracker into your machine)."
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