Topic analysis

Let's Encrypt Develops Custom Tool to Host Test Websites with Valid, Expired, and Revoked SSL Certificates

Let's Encrypt, a nonprofit Certificate Authority under the Internet Security Research Group (ISRG), built a custom Go program to host test websites serving valid, expired, and revoked SSL certificates, replacing their previous complex shell script setup with Certbot and Nginx. This tool addresses the lack of off-the-shelf solutions for maintaining non-expired revoked certificates, using the Lego ACME library for certificate management, Go's built-in web server, and logic to wait for revocation to appear in Certificate Revocation Lists (CRLs) or for certificates to expire before deployment.