Skip to content

SSH

SSH key pair

The key pair consists of a public and a private key. The public key is kept on the server, while the private key is kept on your computer. When you connect via SSH, a trust relationship between your computer and the server is established using the key pair. If any of the keys is missing or there is a discrepancy between the keys, a connection cannot be established.

ssh-keygen

  • The algorithm is selected using the -t option [rsa, dsa, ecdsa, ed25519]

  • The key size using the -b option [2048, 4096]

  • The filename is defined using the -f option

    # create SSH key pair via Linux
ssh-keygen -b 2048 -f id123_ssh_key
# validate SSH key pair via Linux
ssh-keygen -lf id123_ssh_key