Let’s Encrypt can serve at scale because of its approach, driven by these key principles:
Free Anyone who controls a domain can get a certificate validated for that domain at zero cost.
Automatic The entire enrollment process for certificates occurs painlessly during the server’s native installation or configuration process, while renewal occurs automatically in the background.
Secure Let’s Encrypt serves as a platform for implementing modern security techniques and best practices.
Transparent All records of certificate issuance and revocation are available to anyone who wishes to inspect them. Twice annually a Legal Transparency report is published to ensure users have visibility regarding legal requests.
Open The automated issuance and renewal protocol is an open standard and as much of the software as possible is open source.
Cooperative Much like the underlying internet protocols themselves, Let’s Encrypt is a joint effort to benefit the entire public, its public benefit structure means that it operates beyond the control of any one individual or organization.
These principles have served as the foundation of Let’s Encrypt since the beginning. They allow people in need of TLS certificates, anywhere around the world, to get them quickly and easily.
And while this approach greatly benefits technologists seeking to obtain and manage TLS certificates, it serves a wider public benefit. Without this approach, the privacy and security of end users of the majority of websites would be greatly diminished. In other words, this approach directly serves hundreds of thousands of technologists, and indirectly serves billions of interactions on the web every day. The results of this approach mean a more secure internet, a more privacy-respecting web for everyone, everywhere.