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 website's security certificate is expired or invalid.
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 that the browser does not recognize.
The website is using a certificate that has been revoked by the Certificate Authority.
Even if a site's certificate is structurally valid (not expired and correctly signed), the browser will flag it as untrusted if the Certificate Authority (CA) that issued the certificate is not in the browser's trusted root store. This can occur with lesser-known, newly created, or distrusted CAs. Certificates that are expired, self-signed, or revoked generate different specific warnings, so the most likely reason for a "not trusted" message despite a valid certificate is an untrusted CA.
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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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