Finding the Private Key for a TLS/SSL Certificate | Venafi (2024)

TLS Certificates

Posted on August 19, 2022 · 3 minute read ·byAlexa Hernandez

Finding the Private Key for a TLS/SSL Certificate | Venafi (1)

The private key is the most valuable aspect of your TLS/SSL certificate as it verifies your identity and allows you to encrypt and decrypt information. If it is compromised, cybercriminals can use the private key to intercept information — leading to data breaches, fines, and loss of investor and consumer confidence.

What is a private key?

TLS/SSL certificates require both a public key and private key to encrypt and decrypt data. The public key is embedded in the TLS/SSL certificate and is used to encrypt data from the sender. The private key is in a separate file that should be stored securely on your server and can be used for both encryption and decryption. A compromised private key means that anyone with the key can decrypt the sensitive information being transmitted.

Generating a private key

In order to generate a private key, you need to request a TLS/SSL certificate from a Certificate Authority (CA) through a certificate signing request (CSR). Once the request is granted, you will receive a certificate assigned with domain name, public key and additional contact information. The private key will be generated with your CSR as a key pair and should be saved on the server you generated it on. If you lose the private key, it will be impossible to install the certificate and you will need to reissue the certificate.

Locating my private key

If you have not installed the certificate yet, your private key will be saved on the server where you initiated the CSR and generated the key pair. If your certificate is already installed then follow the steps below depending on which system you are using.

Locating a private key in Windows

Your certificate files are managed for you in a private hidden folder. Access the private key by exporting a “.pfx” file that contains the certificate and private key.

  • Open Microsoft Management Console
  • In the Console Root, expand Certificates (Local Computer)
  • Locate the certificate in the Personal or Web Server folder
  • Right click the certificate
  • Select Export
  • Follow the guided wizard

Locating a private key in Apache

The private key will be referenced in the main Apache configuration file (httpd.conf or apache2. conf.). The SSLCertificatekeyFile will identify the path to where your private key is located.

If using OpenSSL on Apache, your private keys are saved to /user/local/ssl by default.

Locating a private key in Nginx

The location of the private key can be found in your site’s virtual host file. Navigate to the server block for that site (typically within /var/ww/directory), open the main configuration file, and search for the ssl_certificate_key directive. This will bring up the file bath for your private key.

Locating a private key in Mac OS X

Use Terminal to navigate to the /etc/certificates folder and open the key file (usually called something similar to “.key.pem”).

If you are unable to find the key, the best thing to do is to reissue the certificate.

Compromised or misplaced private keys

If a private key is misplaced or compromised, there is a chance that it could get misused by a cybercriminal. To avoid this, contact the certificate authority (CA) to get the certificate revoked and reissued.

Managing TLS/SSL certificates

To ensure the security of your information, manage your certificates and private keys carefully. As the number of certificates in your organization increases, as will the number of private keys. Keeping a pulse on the location and security of every private key becomes an inefficient and unsecure process. Venafi’s Control Plane for Machine Identities manages the process for you and ensures that keys and certificates are secure and discoverable.

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Get a 30 Day Free Trial of TLS Protect Cloud, Automated Certificate Management.

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Finding the Private Key for a TLS/SSL Certificate | Venafi (2024)

FAQs

Finding the Private Key for a TLS/SSL Certificate | Venafi? ›

In WHM the Private keys are stored along with the corresponding CSRs and certificates in “SSL Storage manager”. To get there, you can click “SSL/TLS” on the home screen and then on the “SSL Storage manager”. To open the Private key text, you will need to click on the magnifier button in the first column called “Key”.

How do I get a private key for TLS? ›

In WHM the Private keys are stored along with the corresponding CSRs and certificates in “SSL Storage manager”. To get there, you can click “SSL/TLS” on the home screen and then on the “SSL Storage manager”. To open the Private key text, you will need to click on the magnifier button in the first column called “Key”.

How to check SSL certificate private key? ›

Click Domains > your domain > SSL/TLS Certificates. You'll see a page like the one shown below. The key icon with the message “Private key part supplied” means there is a matching key on your server. To get it in plain text format, click the name and scroll down the page until you see the key code.

How to extract a private key from a certificate? ›

Follow these steps to extract the private key using OpenSSL:
  1. Open the command-line tool and navigate to the directory that contains the P12 certificate.
  2. Enter this command: openssl pkcs12 -in [certificate name] -nodes -nocerts -out [private key name]
  3. Enter the passcode for the certificate.

Can we generate private key from SSL certificate? ›

Using the CSR Generator tool

A Certificate Signing Request (CSR) and a private key can be generated using a CSR generator tool, a software application allowing you to create a CSR and a private key for an SSL/TLS certificate.

Where can I find my private keys? ›

Your private key is generated by your wallet and is used to create your public key (your wallet address) using encryption. You can view your private key using your wallet.

Does TLS use public and private keys? ›

Public key cryptography is extremely useful for establishing secure communications over the Internet (via HTTPS). A website's SSL/TLS certificate, which is shared publicly, contains the public key, and the private key is installed on the origin server — it's "owned" by the website.

Why doesn't my certificate have a 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.

Does every certificate have a private key? ›

In summary, certificates are files with a public key and a set of information of its respective private key owner. So, to guarantee correctness and authenticity, certificates are checked and made available by certificate authorities. Of course, we need to trust the certificate authority that hom*ologates a certificate.

Is SSL certificate public or private key? ›

When performing authentication, SSL uses a technique called public-key cryptography. Public-key cryptography is based on the concept of a key pair, which consists of a public key and a private key. Data that has been encrypted with a public key can be decrypted only with the corresponding private key.

How do I recover my private certificate key? ›

In case the RSA Key was deleted from the server and there is no way to restore it, the Reissue is the only way out. You will need to have a new pair of CSR code/RSA Key generated. Before installing your reissued certificate make sure that the old one is completely removed from the server.

Does a CER file contain the private key? ›

A . cer file usually contains only the public key certificate. In contrast, a . pfx file is an all-encompassing container housing private and public key certificates.

How to view private key openssl? ›

Check the CSR, Private Key or Certificate using OpenSSL
  1. Check a CSR openssl req -text -noout -verify -in CSR.csr.
  2. Check a private key openssl rsa -in privateKey.key -check.
  3. Check a certificate openssl x509 -in certificate.crt -text -noout.
  4. Check a PKCS#12 file (.pfx or .p12) openssl pkcs12 -info -in keyStore.p12.

Where can I find the private key of a certificate? ›

Locating a private key in Windows
  1. Open Microsoft Management Console.
  2. In the Console Root, expand Certificates (Local Computer)
  3. Locate the certificate in the Personal or Web Server folder.
  4. Right click the certificate.
  5. Select Export.
  6. Follow the guided wizard.
Aug 19, 2022

What tool is used to generate a private key from a certificate? ›

You can use OpenSSL to create a private key and a certificate signing request (CSR) that can be transformed into a certificate after it is signed by a certificate authority (CA).

Can SSL work without private key? ›

If you lose your private key, you will be unable to install your SSL certificate and will need to generate a new key pair (CSR + Private Key) and re-issue the certificate.

Where can I get a private key? ›

Where's my private key?
  • Open the Microsoft Management Console (MMC).
  • In the Console Root, expand Certificates (Local Computer). Your certificate will be located in the Personal or Web Server folder.
  • Locate and right click the certificate, click Export and follow the guided wizard.

How to create a private key? ›

Steps to Create Public/ Private Key Pair
  1. Step 1: Creating a Private Key. Type command openssl, hit enter and then use the following command to create private key: genrsa -out myprivatekey.pem. ...
  2. Step 2: Create Public Key. Type command openssl, hit enter and then use the following command to create public key:
Jan 2, 2023

How do I download SSL private key? ›

Under All Tasks, right-click on the certificates and click on “Export.” This will open the Export Wizard with instructions to follow. After doing all these steps, you will see a “. pfx” file. This file comprises all the data about the SSL certificate and the private key as well.

Can I get private key from an address? ›

It is not possible for bitcoind to know the private key from the address unless they are both stored in the wallet. Tip: The dumpprivkey command does not generate a private key from an address, as this is impossible.

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