Reinitializing SSH enables you to change the sizes of existing host and server keys.
Clients that have a copy of the old host key give the following warning after they receive a new key from the storage system:
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ WARNING: HOST IDENTIFICATION HAS CHANGED! @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! Someone could be eavesdropping on you right now (man-in-the-middle attack)! It is also possible that the host key has just been changed. Please contact your system administrator. Add correct host key in /u/sisa/.ssh/known_hosts to get rid of this message. Agent forwarding is disabled to avoid attacks by corrupted servers. Are you sure you want to continue connecting (yes/no)?