The first time a client user connects to the server, he or she sees a prompt that includes the fingerprint of the server's public host key. The server administrator can confirm the validity of the key by displaying the host key fingerprint on the server.
To display the fingerprint that identifies the server's public host key
Log in to the server.
Use ssh-keygen to display the host key fingerprint:
ssh-keygen -F /etc/ssh2/hostkey.pub
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