Let's Encrypt: A Free, Automated, and Open Certificate Authority
recording made private on YouTubehttps://youtu.be/ksqTu7TX83g
summary
Let's Encrypt is a free, automated, open CA that builds an ACME-based issuance stack: ACME protocol, the Boulder server, HSM-backed signing and client tools like Certbot and integrated servers such as Caddy. It launches with an IdenTrust cross-sign and Linux Foundation collaboration, issues 90-day certificates to limit key exposure, and reaches about 5.3 million active certs covering ~8.5 million domains while Firefox reports ~45.5% HTTPS page loads—demonstrating rapid, global uptake.
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