Internet Security Research Group
abetterinternet.org
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Overview
Internet Security Research Group is the non-profit that runs Let's Encrypt, the certificate authority which made HTTPS certificates free and automatic. It also operates Prossimo, a project rewriting critical internet software in memory-safe languages, and the Divvi Up privacy-preserving telemetry service. The organisation is funded by sponsors and grants and its certificates secure hundreds of millions of websites.
News
Vulnerabilities and Best Practices in an LLM World
LLMs became essential for vulnerability research and management in early 2026. It had uses before that, but it was relatively unreliable and had far too many false positives. If an open source project got LLM vulnerability reports in 2025, there was a goo
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A Post-Quantum Future for Let's Encrypt
Let's Encrypt is committed to a post-quantum-safe Web PKI. The path we're planning to take is Merkle Tree Certificates ("MTCs"), a new approach that adds post-quantum authentication to the web without sacrificing the speed and reliability that have made T
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Report
Four Years of Momentum: Craig Newmark Philanthropies and the Future of Memory Safety
We are pleased to announce that Craig Newmark Philanthropies has renewed its support for the Internet Security Research Group (ISRG) with a $100,000 grant for 2026. This marks the fourth consecutive year of support from craigslist founder Craig Newmark. A
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Report
On the Importance of "Hello" and "Thanks"
In a recent conversation with a Let's Encrypt subscriber, we asked them to guess how many people work at ISRG, the nonprofit behind Let's Encrypt (and Prossimo and Divvi Up). Their guess was about 100; they'd overestimated by 72.5 people. We're a pretty s
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6-day and IP Address Certificates are Generally Available
Short-lived and IP address certificates are now generally available from Let's Encrypt. These certificates are valid for 160 hours, just over six days. In order to get a short-lived certificate subscribers simply need to select the 'shortlived' certificat
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Offices
Where the company hires and what each office is for
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San Francisco
United States
HQ
Minneapolis
United States
Support & operations
Christine Runnegar (Independent)
PO Box 18666, Minneapolis, MN, 55418-0666, USA