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.