![]() To generate an SSH key pair, you may use the ssh-keygen utility. The first step in setting up SSH key authentication is to generate an SSH key pair on your local computer, the computer you will log in from. When the client attempts to connect to the remote server, the server can verify if the client has a private key that corresponds with one of the authorized keys-if the private key is verified to match an authorized public key, the client is authenticated and a shell session is launched. The public key must be added to a special file within the remote user’s home directory called. To enable the use of a private key for authentication, the corresponding public key is installed to a user’s account on a remote server. It can be used to encrypt messages that only the private key can decrypt-this is the basis of how SSH key authentication works. The associated public key can be shared freely without any negative consequences. The private key is typically at least 2048-bits in length, and can be optionally encrypted with a passphrase (basically a password that is required to use the private key) to limit its use in case an unauthorized person gains access to the key. Its contents must be kept secret-if an unauthorized person gets access to your private key, it should be considered compromised and should be promptly replaced. The private key acts similarly to a password and is kept on the client computer. SSH key pairs can be used instead of passwords for authentication, and each key pair consists of a private key and a corresponding public key. SSH keys provide a reliably secure alternative. ![]() Therefore, they can be susceptible to being compromised by brute force attacks. The issue with passwords is that they are typically are created manually, without sufficient length or complexity in content. While passwords do provide a barrier against unauthorized access, using SSH keys is generally much more secure. ![]() The most common methods include password and SSH key authentication. An SSH server can authenticate clients using a variety of methods.
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