请教ssh key 登录

xiaoshi20cn

想请教下，如何设置同一时间，使用key，只有一个用户登录。
另外sshd_config中KeyRegenerationInterval 1h
如何理解
谢谢

congli

man是这样的
     KeyRegenerationInterval
             In protocol version 1, the ephemeral server key is automatically
             regenerated after this many seconds (if it has been used).  The
             purpose of regeneration is to prevent decrypting captured ses-
             sions by later breaking into the machine and stealing the keys.
             The key is never stored anywhere.  If the value is 0, the key is
             never regenerated.  The default is 3600 (seconds).