Hands-On Reactive Programming with Python

Introduction to Let's Encrypt

Let's Encrypt is a certificate authority that provides TLS certificates for free. Let's Encrypt is one of the most active services currently helping make web communications completely encrypted. This service relies on funds raised from various companies. In 2017, Let's Encrypt's operating costs were only 3 millions dollars, to serve almost 50 million active certificates! As a comparison, the same year, HADOPI, a French government service that aims to fight online media piracy, spent 7.5 million euros (about 8.6 million dollars) on sending about 2 million notification emails and 88 fees.

The success of Let's Encrypt is not only due to the fact that it is free, but also due to the tools provided to automate the ...