![]() You should already have password-based SSH access to your server. The ssh-copy-id tool is added in many operating systems by default. If you do not have ssh-copy-id on the client machine, use the alternate methods shown below. We will copy the public key to the Ubuntu host using a utility called ssh-copy-id. Add the private key on your server for SSH-key-based authentication to log in, as shown in the next steps. You can use the public key on the server to authenticate with the private key on the client machine. ![]() Public key authentication is a secure method of logging in to a remote server using an SSH key pair. SHA256:/hk7MJ5n5aiqdfTVUZr+2Qt+qCiS7BIm5Iv0dxrc3ks key's randomart image is: Your public key has been saved in /your_home/.ssh/id_rsa.pub ![]() The output is shown below - Your identification has been saved in /your_home/.ssh/id_rsa It prevents unauthorized users from logging in and adds another layer of security. You can enter an optional secure passphrase, which is recommended. The following prompt will be displayed: OutputĮnter passphrase (empty for no passphrase): Be cautious about selecting yes, as the changes cannot be reversed. You will not be able to authenticate using the previous key if you overwrite the key on the disk. home/your_home/.ssh/id_rsa already exists. If you have generated an SSH key pair before, you may see the following prompt: Output SSH public key authentication is a secure way to log in to a remote server using an existing key pair. ssh/ subdirectory in your home directory, press enter. You can see the following output after adding the command: OutputĮnter file in which to save the key (/your_home/.ssh/id_rsa): You can also pass in the -b 4096 flag to create a larger 4096-bit key. ![]() This will generate an RSA key pair that is 3072-bit long by default. To create an SSH key on Linux, use ssh-keygen. This will generate a key pair that consists of a public and a private key. To create a new SSH key on Linux, run the following command on the client machine: ssh-keygen. Steps to Creating SSH Keys on Ubuntu 20.04 1. Steps to Creating SSH Keys on Ubuntu 20.04 ![]()
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