Let's Encrypt free SSL/TLS certificates

Let's Encrypt is an automated and open certificate authority (CA) operated by the Internet Security Research Group (ISRG) and founded by the Electronic Frontier Foundation (EFF), the Mozilla Foundation, and others. 
It provides free SSL/TLS certificates which are commonly used to encrypt communications for security and privacy purposes, the most notable use case being HTTPS. Let's Encrypt relies on the ACME (Automatic Certificate Management Environment) protocol to issue, revoke and renew certificates.

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