it's a great technique, one I used a lot in the late 90's, had a port sequence would ping and that was S/KEY and could run on an nokia or anything that could ru

it's a great technique, one I used a lot in the late 90's, had a port sequence would ping and that was S/KEY and could run on an nokia or anything that could run java to get the key from the seed. then dydns and could get ssh open and connect. Probably a bit para, but hey, with security it's only paranoid in hindsight if nothing bad happened. Also added extra layer against any zero day upon ssh. Had it on a openbsd box, firewall script deamon would monitor the firewall logs, pick up the sequence and open ssh for that ip if matched and as sequence was S/KEY, it was always changing. Still cool effective solution. https://en.wikipedia.org/wiki/S/KEY https://en.wikipedia.org/wiki/S/KEY