Websites use digital certificates to protect your privacy and assure your security. The information flowing between your computer and websites is encrypted. However, it is still common to encounter websites that do not have valid digital certificates, despite their importance. In those cases, most of the latest browsers either warn you of the insecure condition or block the website. This proactive measure assures your security and privacy and is also known as the Certificate Error Navigation Blocked warning.

In this assignment, you$$ll take a closer look at certificate errors and share your experiences. Address the following in your write$-$up:

$1.$Describe an instance where you encountered a security certificate warning on a website. What was the reason for the certificate warning? How did it change your perception about the organization behind the website?

$2.$What is the common reason why certificates become invalid and show warning messages?

$3.$How can you determine if the certificate has been revoked?

$4.$What measures can organizations take to ensure that their website maintains a valid certificate?