The public key should be published on the server, completely mark it with the mouse in the Key field and copy it to the clipboard with Ctrl+ C. PuTTY does not accept OpenSSH keys, but in the Conversions menu it is possible to import existing OpenSSH keys and also to export PuTTY keys. ppk has spread for PuTTY keys, because there is a reference to the format that differs from Linux. The file name and the path when saving are free of choice in the chooser, but the extension. On the other hand, in the case of automated processing by scripts, a passphrase is not desired. Once a private key has been lost, unauthorized persons cannot do anything, if is protected by a passphrase. The private key should be kept in a safe place, especially if the private key is not protected by a passphrase. The save of the public key is not absolutely necessary, because it can be calculated at any time from the private key. To save the private key be click on the button Save private key, in the dialog “ are you sure you want to save this key without a passphrase to protect it!“, you can decide to save with or without passphrase. Then you can enter optionally Key passphrase. The necessary random mechanism is provided by moving the mouse freely in the free area of the dialog box during key generation. If you want to generate DSA or ECDSA keys, the desired algorithm can be choose at the parameter box with radio button. To create an RSA key pair, just click on the Generate button. The tool can be found at via Download PuTTY, if you have install PuTTY using the putty-installer.msi, then puttygen can already be found in the Windows Start menu under PuTTY. The PuTTY Key Generator puttygen.exe is used to generate RSA (standard) or DSA and ECDSA key pairs. SSH authentication via asymmetric keys is more secure than using passwords, further public key authentication also enables automated login, for example to log in from scripts without a password request. ( 0) PuTTY SSH login with using puttygen key pairs
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