To generate SSH key in GNU/Linux, use the ssh-keygen command.
Run it in the command line.
ssh-keygen -t dsa
You will be asked for a file in which the key should be saved to and for a passphrase (password) for the key.
This will create a private key written to /home/user/.ssh/id_dsa and a public key written to /home/user/.ssh/id_dsa.pub.
The passphrase is used to protect your key.
You will be asked for it when you connect via SSH.
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