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Day 246/300 SSH connection prompt "remote host identification has changed!"

2022-07-06 06:40:00 【Arden Zhao】

（ One ） demand

I want to connect to the remote server. Both password free login and command line report errors ssh [email protected] - p But there was a mistake , as follows ：

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    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:vdHz3zOlFnQs/O+IkQCmN8FjCUSHJsKgVkD1+7KvmlA.
Please contact your system administrator.
Add correct host key in /Users/zhaoarden/.ssh/known_hosts to get rid of this message.
Offending ED25519 key in /Users/zhaoarden/.ssh/known_hosts:14
Host key for 47.93.247.224 has changed and you have requested strict checking.
Host key verification failed.

（ Two ） analysis

SSH The accessed public keys will be cached in (public key);
On next visit ,SSH Will check the public key , If you don't , There will be an error .
So as not to receive DNS Equal attack of ;