This article describes how to recover a private key after you use the Certificates Microsoft Management Console (MMC) snap-in to delete the original certificate in Internet Information Services (IIS).
Original product version: Internet Information Services Original KB number: 889651
Summary
You delete the original certificate from the personal folder in the local computer's certificate store. This article assumes that you have the matching certificate file backed up as a PKCS#7 file, a .cer file, or a .crt file. When you delete a certificate on a computer that's running IIS, the private key isn't deleted.
Assign the existing private key to a new certificate
To assign the existing private key to a new certificate, you must use the Windows Server version of Certutil.exe. To do it, follow these steps:
Sign in to the computer that issued the certificate request by using an account that has administrative permissions.
Assign the existing private key to a new certificate
Select Start, select Run, type mmc, and then select OK. On the File menu, select Add/Remove Snap-in. In the Add/Remove Snap-in dialog box, select Add. Select Certificates, and then select Add.
In the center pane, right-click on the certificate that you want to export/back up and then click All Tasks > Export. In the Certificate Export Wizard, on the Welcome to the Certificate Export Wizard page, click Next. On the Export Private Key page, select Yes, export the private key, and then, click Next.
You can accomplish this in one of the following ways: If you don't yet have a private key and a corresponding certificate, generate a private key in an HSM. You use the private key to create a certificate signing request (CSR), which you use to create the SSL/TLS certificate.
To generate an SSH private/public key pair for your use, you can use the ssh-keygen command-line utility. You can run the ssh-keygen command from the command line to generate an SSH private/public key pair. If you are using Windows, by default you may not have access to the ssh-keygen command.
Both codes are generated in pair on the hosting server for the website. Thus, the Private key for the issued certificate can only be found on server (application) where you generated the CSR code used during the activation stage.
You cannot directly import private key information to a keystore using keytool . You must convert the certificate and private key into a PKCS12 ( .p12 ) file, and then you can import the PKCS12 file to your keystore. where the [password] is the password you specified when you created the private key.
A missing private key could mean: The certificate is not being installed on the same server that generated the CSR. The pending request was deleted from IIS. The certificate was installed through the Certificate Import Wizard rather than through IIS.
Right-click the openssl.exe file and select Run as administrator. Enter the following command to begin generating a certificate and private key: req -x509 -sha256 -nodes -days 365 -newkey rsa:2048 -keyout privateKey.key -out certificate.
A private key is NOT required to install self-signed certificates on Android. What is required is that the certificate be a CA certificate. That means that the x. 509 'Basic Constraints' extension MUST have the code "CA:true" present in the certificate AFTER it is generated.
All TLS certificates require a private key to work. The private key is a separate file that's used in the encryption/decryption of data sent between your server and the connecting clients.
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