You can't directly use your PuTTY's key in Linux's OpenSSH because the keys are of different formats.
You'll need to first convert PuTTY's key to OpenSSH's key format to be able to use the key.
You can convert PuTTY Private Key (ppk) file to OpenSSH private key using PuTTY Key Generator (PuTTYGen).
Steps to convert PuTTY Private Key to OpenSSH private key using PuTTYgen:
) from the official website and launch the program.
Click on the Load
button on PuTTYGen
's main interface.
Select your PuTTY
's private key file which normally ends with .ppk
extension and click on the Open
Enter the key's passphrase if prompted and then click OK
Details of the imported key will be displayed on the main interface and edit if necessary.
Go to Conversions → Export OpenSSH key
from the menu.
There are an old and new types of SSH key file formats and will be automatically be determined based on the key's type except if you choose Export OpenSSH key (force new file format).
Select the location and file name for your OpenSSH
private key and click on the Save
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