SSH question. How does a private key validate a public key?

Question

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Good day! Question about the SSH protocol. Can you please tell me how the private key confirms the public key if only root has access to it?

Answer 1

set the parameter width: 100px;

Answer 2

Refine your question. SSH keys are host and user. The user's private key is available to the user, and therefore confirms.
The host key is available to root, but the ssh daemon is running as root.
According to how the confirmation itself works - learn the matan and read what an asymmetric algorithm is.
https://en.wikipedia.org/wiki/%D0%AD%D0%BB%D0%B5%D...

Answer 3

Why have the root? Here I have a private key and I'm not Ruth so everything is ok