Obsessing over using the right magic words in your crypto config is at best a waste of time, and risks either making a mistake that reduces security, or more often distracting you from taking care of the things that actually do matter, like managing your key(s) and verifying the host authenticity. The OpenSSH developers are pretty cautious - some would say overly so - and the defaults they set are already more than 'strong' enough. See the man page on your system or on the web, and search for existing Qs here or maybe superuser I know I've seen several.Īlthough it should be noted this won't improve security. Although that Q doesn't note that on client side, in /etc/ssh/ssh_config or ~/.ssh/ssh_config, you can configure either a global setting for all 'hosts' (servers), or different settings for different hosts and/or userids using the Host or Match syntax. On the client, server, or both, as described in the Q linked in a comment. You configure the program, not the key, for those elements. While generating the openssh key, how I do I tell what cipher, MAC and key exchange it should use? And you configure or default the algorithms the client's key can use, as well as any non-publickey methods. And depending on the server, the client (only!) may use other authentication methods like password (often) or GSS (rarely) instead of (any of) the publickey algorithms.Ĭonversely, on a server, you can generate key(s) for particular algorithms, but in practice most servers automatically generate all key types, and provide whichever one(s) the client(s) request. Thus, on a client, you optionally generate one or more key(s) each using a particular algorithm aka 'type' -t (RSA, DSA - formerly, ECDSA, Ed25519), while you configure or default the algorithm(s) you will accept from the server. And while those three elements are functionally symmetric, authentication can be different for each direction. transport: Protocol 2 MAC algorithm '' This is a new transport-layer MAC method using the UMAC algorithm (rfc4418). ![]() Under Internet & Wireless, select Sharing. The protocol used by OpenSSHs ssh-agent is described in the file PROTOCOL.agent 1. The keys you manually generate with ssh-keygen (or equivalent) are used for authentication only, and have no effect at all on the three protocol elements you listed. Procedure Open the Apple menu in the upper left corner of the screen, and select System Preferences. OpenSSH encrypts all traffic (including passwords) to effectively eliminate eavesdropping, connection hijacking, and. Users of telnet, rlogin, and ftp may not realize that their password is transmitted across the Internet unencrypted, but it is. There is a fourth major part of the SSH protocol: authentication. OpenSSH is a free version of the SSH connectivity tools that technical users of the Internet rely on. ![]() Is there any other important part for configuration in openssh?
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