Author

Samantha Frank

Samantha Frank is a Senior Engineer at Let’s Encrypt, a free, automated, and open Certificate Authority brought to you by the nonprofit Internet Security Research Group (ISRG). Support a more secure and privacy-respecting web by donating today.

https://letsencrypt.org/

How Let’s Encrypt reduced the impact of zombie clients

By Samantha Frank on 27 Jun 2025

Guest Post: A new rate limit has significantly reduced the load on Let’s Encrypt’s infrastructure.

Let’s Encrypt scales rate limits to prepare for a billion active certificates

By Samantha Frank on 6 Feb 2025

Guest Post: Let’s Encrypt have evolved rate limits to better serve subscribers and keep the service healthy.