8/21/2023 0 Comments Ssh to ubuntu desktop![]() ![]() It doesn’t mean that it’s not encrypted or that the server has been hacked like some novice users worry about.Įvery time we connect to a server for the first time, ssh adds the fingerprint of that server to a file called known_hosts.Īfter we agree to continue connecting, this server’s fingerprint will be added to that file. This means that it’s the first time we are logging in to this server. ECDSA key fingerprint is SHA256:kg7XIoEPT7i1OOjuoupqqUahuV1joZ1H8yEBcgG7aVo.Īre you sure you want to continue connecting (yes/no/)? Yes ssh-copy-id Īfter running the command we get a warning about the authenticity of the host not being established. With another utility that is part of the openssh networking suite, ssh-copy-id, we will command it to copy our public key to the server we are connecting to. We do by copying our public key to the server we want to connect to. Now that we have a SSH key to use and we know everything about this key, it’s time to connect to another server to use them. It’s important to check a SSH key’s fingerprint to know with which type of keys are we working with, specially in a multi admin environment or if you have inherited the server management from someone else. (ED25519) is the algorithm used in the key.is the system user and hostname of the server.SHA256:Le5ulI2B圎MC0wbRb9KUdtLerM4lK6vt6sWGJUFcy98 is the key’s fingerprint in SHA256 sequence.Once done it will output us the fingerprint. We also use the -f option to indicate the location of the key. The -l option tells it to give us the key’s fingerprint information. We command again ssh-keygen this time with the -l option. A simple way to find out information about the SSH key is with the same ssh-keygen utility. Sometimes when working with servers with SSH keys already setup by other DevOps, it’s important to know what type of SSH keys they are. And with that we have created a SSH key that we can use to connect to another server in an encrypted manner. Your public key has been saved in /root/.ssh/id_ed25519.pub ![]() Your identification has been saved in /root/.ssh/id_ed25519 They come in the form of two files, one to be used as a private key and one to be used as a public key. After that is done ssh-keygen generates a cryptographic key. A passphrase is like a password that must be input for everything the key is going to be used for. Enter passphrase (empty for no passphrase): Then it asks us to give the key a passphrase. We leave it empty so that it will use the default name. Enter file in which to save the key (/root/.ssh/id_ed25519): In this case we are using the ed25519 algorithm which uses elliptic curve cryptography.įirst it asks us to give it a name. With the -t option we tell it which algorithm to use. With the ssh-keygen utility, that is part of the openssh suite, we command it to create a key. ![]()
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