GitHub Accidentally Exposed their SSH RSA Private key, this is the message you will get .
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@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
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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 RSA key sent by the remote host is
SHA256:uNiVztksCsDhcc0u9e8BujQXVUpKZIDTMczCvj3tD2s.
Please contact your system administrator.
Add correct host key in ~/.ssh/known_hosts to get rid of this message.
Host key for github.com has changed and you have requested strict checking.
Host key verification failed.
In this video I discuss how bad is this,.
0:00 Intro
1:10 What happened?
3:00 SSH vs TLS Authentication
6:00 SSH Connect
7:45 How bad is the github leak?
15:00 What should you do?
18:50 Is ECDSA immune?
https://github.blog/2023-03-23-we-updated-our-rsa-ssh-host-key/