Your best bet is to use "key authentication" and then keep the
login key on a floppy or something like a usb keyring storage device. That way you keep the key in a safe place and no one will be able to hijack your key. I'm not familiar with ssh on a cisco, but on a pc key generation is simple.
Generate your ssh-keys with <ssh-keygen -d> for ssh2.
You will have the files $HOME/.ssh/id_dsa.pub and $HOME/.ssh/id_dsa.
The id_dsa.pub - file is your public key. Copy that file to the target to
$HOME/.ssh/machinename.pub and do a
"cd .ssh; cat machinename.pub >>authorized_keys".
Now you should be able to connect to the target
machine via ssh without using passwords.
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