ssh jin@312archx64d5
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    WARNING: REMOTE 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 a host key has just been changed.
The fingerprint for the ED25519 key sent by the remote host is
SHA256:yCFYauGgfpc5y3CNV77VPPW4BL8gyxWFSOIQPISTz4s.
Please contact your system administrator.
Add correct host key in /home/jin/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /home/jin/.ssh/known_hosts:18
Host key for 312archx64d5 has changed and you have requested strict checking.
Host key verification failed.
[jin@312archx64d3 ~]$ ssh-keygen -R 312archx64d5
# Host 312archx64d5 found: line 16
# Host 312archx64d5 found: line 17
# Host 312archx64d5 found: line 18
/home/jin/.ssh/known_hosts updated.
Original contents retained as /home/jin/.ssh/known_hosts.old
[jin@312archx64d3 ~]$ ssh-keygen -R 312archx64d5
Host 312archx64d5 not found in /home/jin/.ssh/known_hosts
[jin@312archx64d3 ~]$ ssh jin@312archx64d5
The authenticity of host '312archx64d5 (192.168.18.105)' can't be established.
ED25519 key fingerprint is SHA256:yCFYauGgfpc5y3CNV77VPPW4BL8gyxWFSOIQPISTz4s.
This key is not known by any other names.
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added '312archx64d5' (ED25519) to the list of known hosts.
jin@312archx64d5's password: 
Permission denied, please try again.
jin@312archx64d5's password: