But securing large, popular websites is only one part of a much bigger battle. Encrypting the entire web requires HTTPS implementation to be accessible to independent, smaller websites. Let’s Encrypt and Certbot have changed the game here, making what was once an expensive, technically demanding process into an easy and affordable task for webmasters across a range of resource and skill levels.
Let’s Encrypt is a Certificate Authority (CA) run by the Internet Security Research Group (ISRG) and founded by EFF, Mozilla, and the University of Michigan, with Cisco and Akamai as founding sponsors. As a CA, Let’s Encrypt issues and maintains digital certificates that help web users and their browsers know they’re actually talking to the site they intended to. CAs are crucial to secure, HTTPS-encrypted communication, as these certificates verify the association between an HTTPS site and a cryptographic public key. Through EFF’s Certbot tool, webmasters can get a free certificate from Let’s Encrypt and automatically configure their server to use it.
Since we announced that Let’s Encrypt was the web’s largest certificate authority last October, it has exploded from 12 million certs to over 28 million. Most of Let’s Encrypt’s growth has come from giving previously unencrypted sites their first-ever certificates.
A large share of these leaps in HTTPS adoption are also thanks to major hosting companies and platforms--like WordPress.com, Squarespace, and dozens of others--integrating Let’s Encrypt and providing HTTPS to their users and customers.