Abstract

Jonas Mücke, Konstantin Gasser, Thomas C. Schmidt, Matthias Wählisch,
Discovering Encrypted Client Hello Deployments by Active ECH Probing,
In: Proc. of ACM Internet Measurement Conference (IMC), p. 276–286, ACM : New York, 2026.
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Abstract: We present a new measurement method to detect ECH deployments. This method leverages standard-compliant behavior of ECH servers. Prior measurements relied on DNS exposure and reported only one major ECH deployment (Cloudflare). Our measurements reveal yet undiscovered ECH deployments, including a large deployment at Meta. Meta servers support ECH, but ECH configuration is not exposed via the DNS. We also empirically study details such as the level of privacy improvement and latency impact of ECH.

 

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