Question

6

How can I force SSH to give an RSA key instead of ECDSA?

rated 0 times [ 6] [ 0] / answers: 1 / hits: 79101 / 1 Year ago, sun, may 14, 2023, 6:29:54

Upon the first time accessing a server, how can I force SSH to give me the RSA key and automatically store it if the user approves?

Presently it is offering me the ECDSA key. Because I already know the RSA key, I would prefer to see the RSA key presented at this point.

I have tried:

ssh -o RSAAuthentication=yes user@server

Unfortunately this gives me an ECDSA key and the Are you sure you want to continue connecting (yes/no)? message.

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tatoethin

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2 Years ago

answered 1 Year ago fieldcheon · Accepted Answer

Don't use RSA since ECDSA is the new default.

On the server do this:
ssh-keygen -l -f /etc/ssh/ssh_host_ecdsa_key.pub
and record that number.

On the client you can SSH to the host and if and when you see that same number, you can answer the prompt Are you sure you want to continue connecting (yes/no)? affirmatively. Then the ECDSA key will get recorded on the client for future use.