What is SSH key and generate SSH key?

What is SSH key and generate SSH key?

Generate an SSH Key Pair

1. Run the ssh-keygen command. You can use the -t option to specify the type of key to create.
2. The command prompts you to enter the path to the file in which you want to save the key.
3. The command prompts you to enter a passphrase.
4. When prompted, enter the passphrase again to confirm it.

What is generated by SSH-keygen?

Ssh-keygen is a tool for creating new authentication key pairs for SSH. Such key pairs are used for automating logins, single sign-on, and for authenticating hosts.

What does SSH-keygen RSA mean?

ssh-keygen generates, manages and converts authentication keys for ssh(1). ssh-keygen can create keys for use by SSH protocol version 2. The type of key to be generated is specified with the -t option. If invoked without any arguments, ssh-keygen will generate an RSA key.

Where do I generate SSH keys?

1. Create a Key Pair on Your Computer

1. Open a terminal window. At the shell prompt, type the following command: ssh-keygen -t rsa.
2. The ssh-keygen program will prompt you for the location of the key file.
3. Note the location to which your public and private key were saved; they will be required in a subsequent step.

Can you generate an OpenSSH key with ssh-keygen?

If you generate a key with OpenSSH using ssh-keygen with the default options, it will work with virtually every server out there. A server that doesn’t accept such a key would be antique, using a different implementation of SSH, or configured in a weird restrictive way. Keys of a non-default type may not be supported on some servers.

What’s the difference between putty SSH and OpenSSH?

PuTTY uses a different key file format. It comes with tools to convert between its own .ppk format and the format of OpenSSH. This ssh-3.2.9.1 you found is a commercial product which has its own different private key format. There isn’t any reason to use it instead of OpenSSH.

How does a client know which SSH key to use?

When a client connects to the host, wishing to use SSH key authentication, it will inform the server of this intent and will tell the server which public key to use. The server then checks its authorized_keys file for the public key, generates a random string, and encrypts it using the public key.

How are fingerprints determined in ssh keygen ( 1 )?

Fingerprints can be determined using ssh-keygen (1): $ ssh-keygen -l -f /etc/ssh/ssh_host_rsa_key If the fingerprint is already known, it can be matched and the key can be accepted or rejected. If only legacy (MD5) fingerprints for the server are available, the ssh-keygen (1) -E option may be used to downgrade the fingerprint algorithm to match.