ok, i got this in my mind and curious if its possible. On linux systems, is there any way to generate a valid algorithmic password combination to login SSH, that we can generate valid password with a little application or device (like o some banks' internet interface,say a key generator if you wish) ? if its possible on sshd, application is not problem.
example scenario:
key generator generates key with an algorithm -> 124a5s589s6fqwer SSHd checks if generated key is valid, and lets login.
Check one-time-passwords (OTP). Here's an example