Let's Encrypt
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A free, automated, and open Certificate Authority operated by the Internet Security Research Group (ISRG) that issues domain-validated (DV) TLS certificates at no cost. Let's Encrypt uses the ACME protocol to automate domain validation, certificate issuance, and renewal, making HTTPS adoption accessible to any server operator. Certificates are valid for 90 days and are renewed automatically by ACME clients such as Certbot, acme.sh, or Caddy. Let's Encrypt has issued over three billion certificates and now secures a majority of HTTPS-enabled websites worldwide.