Generate Ppk From Private Key
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A lost SSH public-key or a web service generates an SSH key but does not provide the public-key part to you. What to do now? There is a solution for this situation.

Press generate and follow instructions to generate (public/private) key pair. Create a new 'authorizedkeys' file (with Notepad): Copy your public key data from the 'Public key for pasting into OpenSSH authorizedkeys file' section of the PuTTY Key Generator,. Generate SSH Key using PuTTYgen With PuTTYgen you can generate SSH key pairs (public and private key) that are used by PuTTY to connect to your server from a Windows client. The private key will be stored on your local machine, while the public key has to be uploaded in your dashboard.

  • How to create a.ppk private key file to use with PuTTY Connecting to a server ordered from us is very easy. However, since passwords are insecure for this sort of thing, we enforce the use of private and public keys.
  • Generating a Secure Shell (SSH) Public/Private Key Pair Several tools exist to generate SSH public/private key pairs. The following sections show how to generate an SSH key pair on UNIX, UNIX-like and Windows platforms.

When you have an SSH key you need the public key to setup SSH passwordless login with SSH-key. But if you have lost the public key part but still have the private key, there is a way to regenerate the key.

With the public key missing, the following command will show you that there is no public key for this SSH key.

The -l option instructs to show the fingerprint in the public key while the -f option specifies the file of the key to list the fingerprint for.

To generate the missing public key again from the private key, the following command will generate the public key of the private key provided with the -f option.

The -y option will read a private SSH key file and prints an SSH public key to stdout. The public key part is redirected to the file with the same name as the private key but with the .pub file extension. If the key has a password set, the password will be required to generate the public key.

To check the details of the generated public key execute the following command as shown above.

The output of this command shows the key size as the first column, the fingerprint as the second column and after the file name, the type is shown in brackets. In the example above, a 4096 bit RSA key.

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How do I convert my Amazon Elastic Compute Cloud (Amazon EC2) Privacy Enhanced Mail (.pem) file to a PuTTY Private Key (.ppk) file? Or, convert a .ppk file to a .pem file?

Short Description

PuTTY doesn't natively support the private key format (.pem) generated by Amazon EC2. You must convert your private key into a .ppk file before you can connect to your instance using PuTTY. You can use the PuTTYgen tool for this conversion. This tool, available for both Windows and Unix operating system, can convert keys.

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Windows - install PuTTYgen

Most Windows operating systems have PuTTY installed. If your system doesn't, download and install PuTTYgen.

Windows - convert a .pem file to a .ppk file

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Start PuTTYgen, and then convert the .pem file to a .ppk file. For detailed steps, see Convert Your Private Key Using PuTTYgen.

Windows - convert a .ppk file to a .pem file

  1. Start PuTTYgen. For Actions, choose Load, and then navigate to your .ppk file.
  2. Choose the .ppk file, and then choose Open.
  3. (Optional) For Key passphrase, enter a passphrase. For Confirm passphrase, re-enter your passphrase.
    Note: Although a passphrase isn't required, you should specify one as a security measure to protect the private key from unauthorized use. Using a passphrase makes automation difficult, because human intervention is needed to log in to an instance or to copy files to an instance.
  4. From the menu at the top of the PuTTY Key Generator, choose Conversions, Export OpenSSH Key.
    Note: If you didn't enter a passphrase, you receive a PuTTYgen warning. Choose Yes.
  5. Name the file and add the .pem extension.
  6. Choose Save.

Unix or Linux - install PuTTY

Install PuTTY, if it's not already on your system.

Generate Ppk From Private Key Software

Important: A PuTTY package is provided by the Extra Packages for Enterprise Linux (EPEL) repository. You must enable the EPEL repository before you install PuTTY.

To install PuTTY, run one of the following commands:

RPM-based

Rsa Private Key To Ppk

Dpkg-based

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Unix or Linux - convert a .pem file to a .ppk file

On the instance shell, run the puttygen command to convert your .pem file to a .ppk file:

Unix or Linux - convert a .ppk file to a .pem file

Run the puttygen command to convert a .ppk file into a .pem file:

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Generate Ppk From Private Key

Daniel shows you how to convert a private key to and from .ppk and .pem formats (3:48)