Hi,

I learnt some basics of automation in linux using ssh.

Suppose that I have distributed my public key to remote systems that I want an access to, and that I have lost my private key.

Under this situation the solution lies in generating a new pair of public and private key using ssh-keygen.

Will generating a new public and private key pair overwrite the previous public key(the private key to which I have lost) or the previous public key would still be available to the person who has stolen my private key.

Regards,

Upendra Pratap Singh

It will overwrite the private and public key for the user/host on which you run the command.

However, any site that has a trust using your public key would also have to get the new public key from the user/host you did the generate on. If you your private key has actually been "stolen" as you said you should advise all people that have the old public key to immediately remove it then add your new one. It is the key rather than the host/user that specifies the source of the connection so anyone with the old private key can pretend to be the user/host that generated it originally.