It will take five years until the root certificate of the free SSL authentication service 'Let's Encrypt' is trusted on all terminals

Blog posted that Let's Encrypt, which issues a root certificate for free, provided certificates to more than 115 million websites as of August 2018. Although it is a root certificate of Let's Encrypt that can support the website by HTTPS for free and is endorsed by many users, it is expected that it will take more than five years to be trusted by all terminals I will.

Let's Encrypt Root Trusted By All Major Root Programs - Let's Encrypt - Free SSL / TLS Certificates
https://letsencrypt.org/2018/08/06/trusted-by-all-major-root-programs.html

Main credentials are kept reliable by obtaining certification from major companies. The root certificate of Let's Encrypt is trusted by leading IT companies including Microsoft, Google, Apple, Mozilla, Oracle, Blackberry, etc. at the time of article creation to ensure reliability as a root certificate.

The root certificate of Let's Encrypt is trusted directly from a relatively new version such as OS, browser, computer terminal etc, but in the world many things that do not trust the root certificate of Let's Encrypt in old system are running It is said that. Of course, some updates are updated so that Let's Encrypt's root certificate is trusted directly from the old system, but some updates are not updated. In this case, as Let's Encrypt, we only have to wait for the old system itself to leave the web ecosystem, and Let's Encrypt estimates it will take over five years.

by Sean MacEntee

Nonetheless, Let's Encrypt has been cross-signed with the root certificate of the world's top share certificate authority, IdenTrust, so it seems that it was widely trusted since the beginning of service provisioning, and it is trusted by all old systems Let's Encrypt says that reliability can be ensured through IdenTrust 's root certificate.