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The command is used when the key is protected by a passphrase.

Passphrase helps to encrypt the private key. –P – Using the command will update the passphrase of a key.However, it is used to recognize the key owner, it’s not reliable completely as any value can be applied to it. Key operation is not affected by a comment. It can be used for the new and/or existing key. -C new-comment – The command will specify the comment to describe the key.– q – The command suppresses the message about progress at the time of key generation.1024 is the perfect size for DSA key, while 2048 or 4096 are the perfect size for RSA keys. -b bits – This command specifies a total number of bit in a particular key.Its acceptable values are RSA and dsa.rsa1. – t keytype – The command specifies the type of key to creating.Keyfile – It is the name of the existing key file to read at the time of changing the current key.Copy that entire text to your clipboard by pressing ctrl+c as you will require the key to paste on your clipboard in the public key tool of control panel or directly on the cloud server. You will see the text starting with ssh-RSA in the Public key for pasting into OpenSSH authorized_keys file field which is located at the top of the window.Click on the “Save Public Key” and “Save Private Key” buttons to save your public and private keys.

Now you will need to add a unique key passphrase in the Key passphrase and Confirm passphrase field.Clicking on it will lead to generating the keys for you. You will find a “Generate” button in that dialog.You will see the PuTTY key generator dialog box on your screen.For the same, go to Windows -> Start Menu -> All Programs -> PuTTY -> PuTTYgen.

Once you install the PuTTY on your machine, you can easily run PuTTYgen.Below is the complete guidance about how to generate RSA key in the Windows operating system: PuTTYgen is used to generate public or private key pair for creating SSH keys.