SSL Certificate Validation Methods and Tips

In today's digital world, ensuring internet security is more important than ever. SSL certificates are one of the cornerstones of this security. So, how can you check if an SSL certificate is valid? In this article, you will find the answer to the question "How to check an SSL certificate".

What is SSL Certificate Validation and Why is it Important?

An SSL (Secure Sockets Layer) certificate is a security protocol used to establish a secure connection between websites and users. This certificate ensures that data is transmitted in an encrypted form, preventing third-party access. Validating an SSL certificate is crucial for confirming the identity of a website and ensuring the protection of data. The validation process allows users to exchange information securely and protects them from threats like phishing attacks.

How to Check SSL Certificate Through a Browser?

Browsers allow you to check the validity of SSL certificates. Here's how to do it step by step:

• Step 1: Go to the website and click on the lock icon in the URL bar. This icon indicates that the connection is secure.
• Step 2: You will see a message like “Connection is secure” or “Not secure.” A secure connection is indicated by the lock icon.
• Step 3: After clicking on the lock icon, click on the “Certificate” or “Certificate Information” option. This will display the certificate details.
• Step 4: Check the certificate’s validity period, the certificate provider, and other details. If the validity period has expired, you should not trust this certificate.

How to Check SSL Certificate Using Command Line?

Command line tools provide an effective way to validate SSL certificates. Here are some commonly used methods:

• OpenSSL: OpenSSL is a popular tool used to work with SSL/TLS protocols. To check the validity of a certificate, use the following command:

  openssl s_client -connect www.example.com:443 -showcerts

  This command connects to the specified website and shows the certificate information.
• cURL: cURL is another tool used for data transfers. To check an SSL certificate, use the following command:

  curl -vI https://www.example.com

  This command shows the SSL certificate and other connection details of the website.

SSL Certificate Validity Period and Renewal Tips

SSL certificates have a specific validity period and need to be renewed after that period. Here are some tips for managing this process:

• Check the Validity Period: Use a browser or command line tools to check the certificate’s validity period. You will receive a warning for certificates that are about to expire.
• Automatic Renewal: Many certificate providers offer automatic renewal services. By enabling this service, you can ensure the certificate is renewed before it expires.
• Backup and Record: Regularly backup your certificate and private keys. Also, record renewal dates in your calendars.

Checking SSL Certificates with Third-Party Tools

Third-party tools provide user-friendly interfaces for checking SSL certificates. Here are some popular tools:

• SSL Labs: SSL Labs is a tool used to test the quality and security of SSL certificates. By entering your website’s URL, you can get a detailed analysis report.
• SSL Checker: SSL Checker allows you to check if your certificate is correctly installed and verify its validity period.
• Why No Padlock: Why No Padlock helps you identify issues related to your website’s SSL certificate.

Frequently Asked Questions

• What is an SSL certificate? An SSL certificate is a digital certificate used to secure the connection between websites and users.
• How long is the validity period of an SSL certificate? SSL certificates are usually valid for 1 to 2 years, but this period may vary depending on the certificate provider.
• What is the easiest way to check an SSL certificate? The easiest method is to click on the lock icon in the browser to view the certificate details.
• What happens if there is no SSL certificate? Websites without an SSL certificate cannot encrypt user data, which makes them vulnerable to data breaches and phishing attacks.