Cloudflare Research: TLS Encrypted ClientHello experiment

On a small fraction of our challenge pages, we are running an experiment to measure the performance impact of TLS Encrypted ClientHello (ECH). We are performing these measurements to measure the deployability of this emerging standard.

What is the experiment?

For challenge pages that are part of the experiment, we launch two background connections. On these background connections, we enable ECH and on the other we disable ECH. We then measure how often each of these connections succeeds, with the expectation that they succeed with approximately the same percentage of time.

Contact

You can reach us directly at ask-research@cloudflare.com with questions and feedback.