A user encounters a website with a valid security certificate, but their web browser displays a warning that the website is not trusted. What is the most likely explanation for this scenario?
The user's web browser is outdated and does not support the website's security protocols.
The website's security certificate is expired or invalid.
The website is using a compromised certificate that has been revoked by the Certificate Authority.
The Certificate Authority that issued the website's certificate is not trusted by the user's browser.
The website is using a self-signed certificate, which is not recognized by the user's browser.
A website can have a valid certificate, meaning it has been issued by a Certificate Authority, and still not be trusted by the user's browser. This happens when the Certificate Authority issuing the certificate is not recognized or trusted by the browser. This could happen because the Certificate Authority is not well-known or has been compromised in the past. The browser could also be configured to only trust certificates from specific Certificate Authorities.
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What is a Certificate Authority (CA)?
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What does it mean for a certificate to be revoked?
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How can a user check if a website's certificate is valid?