I’m not well versed on the use of SSL certs. I’m curious how widely trusted is the CA Root for Let’s Encrypt?
The organization that runs Let’s Encrypt, the Internet Security Research Group, has its own root certificate which is starting to be trusted by some browsers. However, this is a long process and this root certificate is not actively used yet (because of browser compatibility concerns).
The root certificate that’s currently used by Let’s Encrypt is not directly controlled by Let’s Encrypt. Rather, it’s from Identrust, which is a separate organization which agreed to sign Let’s Encrypt’s intermediate certificate. The Identrust root certificate is a long-standing major root that is very widely trusted by browsers.
One thread on this forum discussing compatibility of the Identrust root ishttps://community.letsencrypt.org/t/which-browsers-and-operating-systems-support-lets-encrypt?source_topic_id=38794
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