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Keep this passphrase somewhere secure so you can get to it later (you'll need it anytime you want to use your private key from a new computer). When you've shuffled your key around the area enough, the green bar will reach the right side and PuTTYgen will create your keypair and you will see something like this: Just fill in the Key comment field (your name is a good idea), and enter a STRONG passphrase including upper and lowercase letters, numbers, and symbols. PuTTYgen will then ask you to wiggle your mouse around for a while to help it generate the key. If you are unsure what to choose, just copy the settings shown below.
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The public key can be freely installed on remote systems. The private key remains on your computer and should be kept safe from unauthorised access. Public/private key authentication, as the name suggests, uses two special cryptographic text files (called keys) to authenticate your login.
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This article assumes you have already installed the PuTTY suite of applications. Enhancing SFTP Access using Filezilla with public/private keys.
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