课程第29次
192.168.0.4 ssh连接 192.168.0.5的时候， 前者是Alice，后者是Bob（谁输入密码谁是Alice, 谁有公钥和私钥对谁是Bob）
如果BOB的公钥不对的话，Alice出现：
# ssh 192.168.0.5
ssh_exchange_identification: read: Connection reset by peer
# ssh 192.168.0.5
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ 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 ECDSA key sent by the remote host is
SHA256:mD3xiUZRelmK4f4aQPpn/CyWd0umnJ5UAYDwQ6tZd10.
Please contact your system administrator.
Add correct host key in /root/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /root/.ssh/known_hosts:4
ECDSA host key for 192.168.0.5 has changed and you have requested strict checking.
Host key verification failed.
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