How Encrypted Client Hello (ECH) Impacts Content Filtering Solutions: Challenges and Adaptations

Encrypted Client Hello (ECH) is a new protocol designed to improve privacy in TLS (Transport Layer Security) connections. ECH’s main function is to encrypt the ClientHello message—the initial message a client sends to a server during the TLS handshake. The ClientHello message typically contains metadata, such as the Server Name Indication (SNI), that can reveal […]