Let's Encrypt is a free service that generates certificates to secure your website. It supports generating different types of certificates, including single-domain and wildcard. In addition, it has numerous methods to authenticate your domain to generate a certificate. - `http-01` (Simple HTTP) - `dns-01` (DNS validation) - `tls-sni-01` (Validation through the use of a self-signed certificate - **now deprecated**) Unfortunately, a vulnerability was discovered in January of 2018 where it ......