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ssh-keygen

The sudo ssh-key command is used to create ssh key pairs

ssh-keygen

<code> usage: ssh-keygen [-q] [-a rounds] [-b bits] [-C comment] [-f output_keyfile]

                [-m format] [-N new_passphrase] [-O option]
                [-t dsa | ecdsa | ecdsa-sk | ed25519 | ed25519-sk | rsa]
                [-w provider] [-Z cipher]
     ssh-keygen -p [-a rounds] [-f keyfile] [-m format] [-N new_passphrase]
                 [-P old_passphrase] [-Z cipher]
     ssh-keygen -i [-f input_keyfile] [-m key_format]
     ssh-keygen -e [-f input_keyfile] [-m key_format]
     ssh-keygen -y [-f input_keyfile]
     ssh-keygen -c [-a rounds] [-C comment] [-f keyfile] [-P passphrase]
     ssh-keygen -l [-v] [-E fingerprint_hash] [-f input_keyfile]
     ssh-keygen -B [-f input_keyfile]
     ssh-keygen -D pkcs11
     ssh-keygen -F hostname [-lv] [-f known_hosts_file]
     ssh-keygen -H [-f known_hosts_file]
     ssh-keygen -K [-a rounds] [-w provider]
     ssh-keygen -R hostname [-f known_hosts_file]
     ssh-keygen -r hostname [-g] [-f input_keyfile]
     ssh-keygen -M generate [-O option] output_file
     ssh-keygen -M screen [-f input_file] [-O option] output_file
     ssh-keygen -I certificate_identity -s ca_key [-hU] [-D pkcs11_provider]
                [-n principals] [-O option] [-V validity_interval]
                [-z serial_number] file ...
     ssh-keygen -L [-f input_keyfile]
     ssh-keygen -A [-a rounds] [-f prefix_path]
     ssh-keygen -k -f krl_file [-u] [-s ca_public] [-z version_number]
                file ...
     ssh-keygen -Q [-l] -f krl_file [file ...]
     ssh-keygen -Y find-principals -s signature_file -f allowed_signers_file
     ssh-keygen -Y match-principals -I signer_identity -f allowed_signers_file
     ssh-keygen -Y check-novalidate -n namespace -s signature_file
     ssh-keygen -Y sign -f key_file -n namespace file [-O option] ...
     ssh-keygen -Y verify -f allowed_signers_file -I signer_identity
                -n namespace -s signature_file [-r krl_file] [-O option]</code)

ssh-keygen default

ssh-keygen creates a SSH key pair. The defaults are:
- home directory /homeuser/.ssh
- public key /home/user/.ssh/id_rsa
- private key /home/user/.ssh/id_rsa.pub

ssh-keygen with filename

ssh-keygen -f .ssh/key-with-password creates a SSH key with non-default name and location. The defaults are:
- public key /home/user/.ssh/key-with-password
- private key /home/user/.ssh/key-with-password.pub

Warning

**During further SSH key pair generation, if you do not specify a unique file name, you are prompted for permission to overwrite the existing id_rsa and id_rsa.pub files. If you overwrite the existing id_rsa and id_rsa.pub files, you must then replace the old public key with the new one on ALL of the SSH servers that have your old public key. **

Once you have generated the keys, they are stored in the /user/home/.ssh/ directory with the following permissions:

Private key - 600
Public key - 644

Using ssh-keygen and sharing for key-based authentication in Linux

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ssh with key files

ssh with key files

ssh-keygen

ssh-keygen default

ssh-keygen with filename

Warning